{"id":10704,"date":"2026-07-29T01:17:13","date_gmt":"2026-07-29T01:17:13","guid":{"rendered":"https:\/\/researcher.life\/blog\/?p=10704"},"modified":"2026-07-29T06:53:51","modified_gmt":"2026-07-29T06:53:51","slug":"what-is-experimental-research-design-definition-examples-types","status":"publish","type":"post","link":"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/","title":{"rendered":"What Is Experimental Research Design? Definition, Types, Steps, and Examples"},"content":{"rendered":"<p><strong>Key Takeaways:<\/strong><\/p>\n<ul>\n<li>Experimental research design tests cause and effect by manipulating an independent variable and measuring change in a dependent variable.<\/li>\n<li>The 3 core categories, pre-experimental, quasi-experimental, and true experimental, differ mainly by random assignment and the presence of a control group.<\/li>\n<li>Confounding variables and other threats to validity can distort results unless researchers plan for them before data collection begins.<\/li>\n<li>A strong design includes a clear hypothesis, a calculated sample size, a randomization plan, and a statistical test chosen in advance.<\/li>\n<\/ul>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_68 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Glossary_of_Key_Terms\" title=\"Glossary of Key Terms\">Glossary of Key Terms<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#What_Is_Experimental_Research_Design\" title=\"What Is Experimental Research Design?\">What Is Experimental Research Design?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Why_Experimental_Research_Design_Matters\" title=\"Why Experimental Research Design Matters\">Why Experimental Research Design Matters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#What_Are_the_Main_Types_of_Experimental_Research_Design\" title=\"What Are the Main Types of Experimental Research Design?\">What Are the Main Types of Experimental Research Design?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Pre-experimental_Research_Design\" title=\"Pre-experimental Research Design\">Pre-experimental Research Design<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Quasi-experimental_Research_Design\" title=\"Quasi-experimental Research Design\">Quasi-experimental Research Design<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#True_Experimental_Research_Design\" title=\"True Experimental Research Design\">True Experimental Research Design<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Between-Subjects_Within-Subjects_and_Factorial_Designs\" title=\"Between-Subjects, Within-Subjects, and Factorial Designs\">Between-Subjects, Within-Subjects, and Factorial Designs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#How_to_Choose_the_Right_Experimental_Research_Design\" title=\"How to Choose the Right Experimental Research Design\">How to Choose the Right Experimental Research Design<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Step_1_Match_the_goal_to_a_design_category\" title=\"Step 1: Match the goal to a design category.\">Step 1: Match the goal to a design category.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Step_2_Check_feasibility\" title=\"Step 2: Check feasibility.\">Step 2: Check feasibility.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Step_3_Weigh_resources_against_rigor\" title=\"Step 3: Weigh resources against rigor.\">Step 3: Weigh resources against rigor.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Step_4_Weigh_validity_trade-offs\" title=\"Step 4: Weigh validity trade-offs.\">Step 4: Weigh validity trade-offs.<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#How_to_Choose_Between_Quasi-Experimental_and_Experimental_Designs\" title=\"How to Choose Between Quasi-Experimental and Experimental Designs\">How to Choose Between Quasi-Experimental and Experimental Designs<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Step_1_Check_for_barriers_to_randomization\" title=\"Step 1: Check for barriers to randomization.\">Step 1: Check for barriers to randomization.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Step_2_Compare_the_2_options_directly\" title=\"Step 2: Compare the 2 options directly.\">Step 2: Compare the 2 options directly.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Step_3_Match_the_decision_to_the_situation\" title=\"Step 3: Match the decision to the situation.\">Step 3: Match the decision to the situation.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Step_4_Confirm_the_trade-off_is_acceptable\" title=\"Step 4: Confirm the trade-off is acceptable.\">Step 4: Confirm the trade-off is acceptable.<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Steps_to_Design_an_Experiment\" title=\"Steps to Design an Experiment\">Steps to Design an Experiment<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Randomization_and_Blinding_in_Experimental_Research\" title=\"Randomization and Blinding in Experimental Research\">Randomization and Blinding in Experimental Research<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Types_of_Randomization\" title=\"Types of Randomization\">Types of Randomization<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Types_of_Blinding\" title=\"Types of Blinding\">Types of Blinding<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#What_Are_Confounding_Variables_and_Threats_to_Validity\" title=\"What Are Confounding Variables and Threats to Validity?\">What Are Confounding Variables and Threats to Validity?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Types_of_Validity_in_Experimental_Research\" title=\"Types of Validity in Experimental Research\">Types of Validity in Experimental Research<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Sample_Size_and_Statistical_Power\" title=\"Sample Size and Statistical Power\">Sample Size and Statistical Power<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Statistical_Tests_Used_to_Analyze_Experimental_Data\" title=\"Statistical Tests Used to Analyze Experimental Data\">Statistical Tests Used to Analyze Experimental Data<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Worked_Example_Designing_a_Simple_Experiment\" title=\"Worked Example: Designing a Simple Experiment\">Worked Example: Designing a Simple Experiment<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Common_Mistakes_in_Experimental_Research_Design\" title=\"Common Mistakes in Experimental Research Design\">Common Mistakes in Experimental Research Design<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Experimental_Research_vs_Other_Research_Designs\" title=\"Experimental Research vs Other Research Designs\">Experimental Research vs Other Research Designs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Advantages_and_Disadvantages_of_Experimental_Research_Design\" title=\"Advantages and Disadvantages of Experimental Research Design\">Advantages and Disadvantages of Experimental Research Design<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Advantages\" title=\"Advantages\">Advantages<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Disadvantages\" title=\"Disadvantages\">Disadvantages<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Ethical_Considerations_in_Experimental_Research\" title=\"Ethical Considerations in Experimental Research\">Ethical Considerations in Experimental Research<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-34\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Checklist_for_a_Sound_Experimental_Research_Design\" title=\"Checklist for a Sound Experimental Research Design\">Checklist for a Sound Experimental Research Design<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-35\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Frequently_Asked_Questions\" title=\"Frequently Asked Questions\">Frequently Asked Questions<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-36\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#What_Is_the_Difference_Between_Experimental_and_Quasi-Experimental_Research_Design\" title=\"What Is the Difference Between Experimental and Quasi-Experimental Research Design?\">What Is the Difference Between Experimental and Quasi-Experimental Research Design?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-37\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#How_Many_Participants_Are_Needed_for_a_True_Experimental_Design\" title=\"How Many Participants Are Needed for a True Experimental Design?\">How Many Participants Are Needed for a True Experimental Design?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-38\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#What_Is_the_Difference_Between_Internal_Validity_and_External_Validity\" title=\"What Is the Difference Between Internal Validity and External Validity?\">What Is the Difference Between Internal Validity and External Validity?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-39\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Can_Experimental_Research_Be_Conducted_Without_a_Control_Group\" title=\"Can Experimental Research Be Conducted Without a Control Group?\">Can Experimental Research Be Conducted Without a Control Group?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-40\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#What_Is_the_Difference_Between_a_Within-Subjects_and_a_Between-Subjects_Design\" title=\"What Is the Difference Between a Within-Subjects and a Between-Subjects Design?\">What Is the Difference Between a Within-Subjects and a Between-Subjects Design?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-41\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Why_Is_Random_Assignment_Important_in_Experimental_Research\" title=\"Why Is Random Assignment Important in Experimental Research?\">Why Is Random Assignment Important in Experimental Research?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-42\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#Is_Quasi-Experimental_Design_Considered_Scientific_Research\" title=\"Is Quasi-Experimental Design Considered Scientific Research?\">Is Quasi-Experimental Design Considered Scientific Research?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-43\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#What_Software_Is_Used_to_Analyze_Experimental_Research_Data\" title=\"What Software Is Used to Analyze Experimental Research Data?\">What Software Is Used to Analyze Experimental Research Data?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-44\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-experimental-research-design-definition-examples-types\/#References\" title=\"References\">References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Glossary_of_Key_Terms\"><\/span><strong>Glossary of Key Terms<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The terms below appear throughout this article and are commonly searched alongside experimental research design.<\/p>\n<table width=\"624\">\n<thead>\n<tr>\n<td width=\"173\"><strong>Term<\/strong><\/td>\n<td width=\"451\"><strong>Definition<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td width=\"173\"><a href=\"https:\/\/researcher.life\/blog\/article\/independent-vs-dependent-variables-definition-examples\/#What_is_an_independent_variable\">Independent variable<\/a><\/td>\n<td width=\"451\">The variable a researcher manipulates or changes on purpose.<\/td>\n<\/tr>\n<tr>\n<td width=\"173\"><a href=\"https:\/\/researcher.life\/blog\/article\/independent-vs-dependent-variables-definition-examples\/#What_is_a_dependent_variable\">Dependent variable<\/a><\/td>\n<td width=\"451\">The outcome a researcher measures to see the effect of the independent variable.<\/td>\n<\/tr>\n<tr>\n<td width=\"173\"><a href=\"https:\/\/www.editage.com\/blog\/control-group\/\">Control group<\/a><\/td>\n<td width=\"451\">A group that does not receive the treatment and serves as a baseline for comparison.<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">Random assignment<\/td>\n<td width=\"451\">Placing participants into groups by chance so each has an equal probability of any group.<\/td>\n<\/tr>\n<tr>\n<td width=\"173\"><a href=\"https:\/\/www.editage.com\/blog\/confounding-variables-identification-definition-types-examples\">Confounding variable<\/a><\/td>\n<td width=\"451\">A third variable linked to both the independent and dependent variable that can distort results.<\/td>\n<\/tr>\n<tr>\n<td width=\"173\"><a href=\"https:\/\/www.editage.com\/blog\/internal-validity-external-validity-definition-differences-examples\/#What_Is_Internal_Validity\">Internal validity<\/a><\/td>\n<td width=\"451\">Confidence that a study&#8217;s results are caused by the treatment and not by another factor.<\/td>\n<\/tr>\n<tr>\n<td width=\"173\"><a href=\"https:\/\/www.editage.com\/blog\/internal-validity-external-validity-definition-differences-examples\/#What_Is_External_Validity\">External validity<\/a><\/td>\n<td width=\"451\">The extent to which results can be generalized beyond the study sample and setting.<\/td>\n<\/tr>\n<tr>\n<td width=\"173\"><a href=\"https:\/\/researcher.life\/blog\/article\/what-is-construct-validity-definition-types-and-examples\/\">Construct validity<\/a><\/td>\n<td width=\"451\">The degree to which a study measures the concept it claims to measure.<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">Statistical conclusion validity<\/td>\n<td width=\"451\">The extent to which conclusions about a relationship between variables are statistically sound.<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">Randomization<\/td>\n<td width=\"451\">The process of assigning participants to groups using chance rather than researcher choice.<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">Blinding<\/td>\n<td width=\"451\">Keeping participants, researchers, or both unaware of group assignment to reduce bias.<\/td>\n<\/tr>\n<tr>\n<td width=\"173\"><a href=\"https:\/\/www.editage.com\/blog\/between-subjects-design\/\">Between-subjects design<\/a><\/td>\n<td width=\"451\">A design in which each participant experiences only 1 treatment condition.<\/td>\n<\/tr>\n<tr>\n<td width=\"173\"><a href=\"https:\/\/www.editage.com\/blog\/within-subjects-design\/\">Within-subjects design<\/a><\/td>\n<td width=\"451\">A design in which each participant experiences all treatment conditions.<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">Factorial design<\/td>\n<td width=\"451\">A design that tests 2 or more independent variables at the same time.<\/td>\n<\/tr>\n<tr>\n<td width=\"173\"><a href=\"https:\/\/www.editage.com\/blog\/sample-size-and-statistical-power-definition-formulas-calculations-worked-examples\/\">Statistical power<\/a><\/td>\n<td width=\"451\">The probability that a study will detect a true effect if one exists.<\/td>\n<\/tr>\n<tr>\n<td width=\"173\"><a href=\"https:\/\/www.editage.com\/blog\/operationalization-research-definition-examples\/\">Operationalization<\/a><\/td>\n<td width=\"451\">Turning an abstract concept into a measurable variable.<\/td>\n<\/tr>\n<tr>\n<td width=\"173\"><a href=\"https:\/\/researcher.life\/blog\/article\/what-is-attrition-bias-definition-causes-examples-mitigation-strategies\/\">Attrition<\/a><\/td>\n<td width=\"451\">The loss of participants from a study before it is complete.<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">Regression to the mean<\/td>\n<td width=\"451\">The tendency for extreme scores to move closer to average on repeated measurement.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_Experimental_Research_Design\"><\/span><strong>What Is Experimental Research Design?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Experimental research design is a method in which a researcher manipulates an independent variable and measures its effect on a dependent variable to test cause and effect.<\/p>\n<p>Participants are usually assigned to a treatment group or a control group. The design also sets the setting, the sample, and the level of control needed to rule out other explanations for the result.<\/p>\n<p>Experiments can run in a laboratory or in the field. Laboratory studies offer high internal validity because researchers can control most variables. Field studies offer higher external validity because they reflect real conditions, though they are harder to control.<\/p>\n<p>Common examples include:<\/p>\n<ul>\n<li>Testing a new medicine against a placebo in a <a href=\"https:\/\/www.editage.com\/blog\/randomized-controlled-trial-rct\/\">clinical trial<\/a>.<\/li>\n<li>Comparing 2 teaching methods using student test scores.<\/li>\n<li>Measuring how a price change affects online sales.<\/li>\n<li>Testing a new onboarding flow against user retention in a software product.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Why_Experimental_Research_Design_Matters\"><\/span><strong>Why Experimental Research Design Matters<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Establishes causality: shows whether a change in the independent variable causes a change in the dependent variable.<\/li>\n<li>Controls variables: reduces the chance that outside factors explain the result.<\/li>\n<li>Produces reliable evidence: a structured method lowers the risk of bias and measurement error.<\/li>\n<li>Supports decisions: gives organizations and researchers evidence for product, policy, and clinical choices.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"What_Are_the_Main_Types_of_Experimental_Research_Design\"><\/span><strong>What Are the Main Types of Experimental Research Design?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>There are 3 main types of experimental research design: pre-experimental, <a href=\"https:\/\/www.editage.com\/blog\/quasi-experimental-designs-and-how-they-work-in-biomedical-research\/\">quasi-experimental<\/a>, and true experimental. They differ mainly in whether participants are randomly assigned and whether a control group is used.<\/p>\n<table width=\"624\">\n<thead>\n<tr>\n<td width=\"173\"><strong>Design type<\/strong><\/td>\n<td width=\"147\"><strong>Random assignment<\/strong><\/td>\n<td width=\"147\"><strong>Control group<\/strong><\/td>\n<td width=\"157\"><strong>Typical use<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td width=\"173\">Pre-experimental<\/td>\n<td width=\"147\">No<\/td>\n<td width=\"147\">Rarely<\/td>\n<td width=\"157\">Early, exploratory testing<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">Quasi-experimental<\/td>\n<td width=\"147\">No<\/td>\n<td width=\"147\">Sometimes<\/td>\n<td width=\"157\">Field settings where randomization is not possible<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">True experimental<\/td>\n<td width=\"147\">Yes<\/td>\n<td width=\"147\">Yes<\/td>\n<td width=\"157\">Studies that need the strongest causal evidence<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Pre-experimental_Research_Design\"><\/span><strong>Pre-experimental Research Design<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Pre-experimental designs examine change in 1 or more groups without random assignment or a full control structure. Researchers often use them to decide whether a larger study is worth running.<\/p>\n<ul>\n<li>One-shot case study design: a single group is tested once after a treatment, with no pretest and no control group.<\/li>\n<li>One-group pretest-posttest design: a single group is tested before and after treatment, and any change is assumed to come from the treatment.<\/li>\n<li>Static-group comparison: 1 group receives the treatment and a second group does not, and both are tested afterward without a pretest.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Quasi-experimental_Research_Design\"><\/span><strong>Quasi-experimental Research Design<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Quasi-experimental design sits between a true experiment and an observational study. Researchers use it when random assignment is not ethical or practical, such as in field settings, public health, and nursing research.<\/p>\n<p>Common formats include the posttest-only design with a control group, the one-group pretest-posttest design, and the pretest-posttest design with a control group. A 22-item reporting checklist for nonrandomized studies helps researchers report these designs with more transparency.<\/p>\n<ul>\n<li>Posttest-only with control group: 2 similar hospitals adopt different hand hygiene protocols, and infection rates are compared afterward without a pretest.<\/li>\n<li>One-group pretest-posttest: participants are weighed before and after a 3-month exercise program, with no comparison group.<\/li>\n<li>Pretest-posttest with control group: older adults at 1 senior center use a memory training app while a comparable group at another center continues usual activities, and both groups are tested before and after.<\/li>\n<\/ul>\n<p>These designs are useful in real-world settings, such as after a hurricane or other natural disaster, but they carry a higher risk of confounding, selection bias, and history effects because participants are not randomly assigned.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"True_Experimental_Research_Design\"><\/span><strong>True Experimental Research Design<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>True experimental design uses random assignment and a control group, which gives it the strongest basis for causal claims among the 3 design types.<\/p>\n<ul>\n<li>Posttest-only control group design: groups are tested only after the intervention, which avoids pretest bias but limits before-and-after comparison.<\/li>\n<li>Pretest-posttest control group design: both groups are tested before and after the intervention, which allows a direct comparison of change over time.<\/li>\n<li>Solomon 4-group design: 4 groups are used, 2 with a pretest and 2 without, which helps separate the effect of testing itself from the effect of the treatment.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Between-Subjects_Within-Subjects_and_Factorial_Designs\"><\/span><strong>Between-Subjects, Within-Subjects, and Factorial Designs<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Beyond the 3 main categories, researchers also choose how participants move through treatment conditions. This choice affects sample size, statistical tests, and the risk of certain biases.<\/p>\n<table width=\"624\">\n<thead>\n<tr>\n<td width=\"127\"><strong>Design<\/strong><\/td>\n<td width=\"193\"><strong>How participants are assigned<\/strong><\/td>\n<td width=\"193\"><strong>Main advantage<\/strong><\/td>\n<td width=\"111\"><strong>Main limitation<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td width=\"127\">Between-subjects<\/td>\n<td width=\"193\">Each participant receives only 1 condition<\/td>\n<td width=\"193\">Avoids carryover effects between conditions<\/td>\n<td width=\"111\">Needs more participants overall<\/td>\n<\/tr>\n<tr>\n<td width=\"127\">Within-subjects<\/td>\n<td width=\"193\">Each participant receives all conditions<\/td>\n<td width=\"193\">Needs fewer participants and controls individual differences<\/td>\n<td width=\"111\">Risk of order and practice effects<\/td>\n<\/tr>\n<tr>\n<td width=\"127\">Factorial<\/td>\n<td width=\"193\">Participants receive combinations of 2 or more variables<\/td>\n<td width=\"193\">Tests main effects and interactions together<\/td>\n<td width=\"111\">More complex to design and analyze<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p>Counterbalancing, changing or reversing the order of conditions among participants, helps reduce order effects in within-subjects designs. Matched pairs, in which participants are paired on a key trait before assignment, are sometimes used in between-subjects designs to balance the groups.<\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_to_Choose_the_Right_Experimental_Research_Design\"><\/span>How to Choose the Right Experimental Research Design<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Choosing a design starts with the research question, not a preference for one method.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Step_1_Match_the_goal_to_a_design_category\"><\/span>Step 1: Match the goal to a design category.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<table>\n<thead>\n<tr>\n<td><strong>Goal<\/strong><\/td>\n<td><strong>Best-fit design<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Establish cause and effect<\/td>\n<td>Experimental<\/td>\n<\/tr>\n<tr>\n<td>Explore a pattern before committing resources<\/td>\n<td>Pre-experimental<\/td>\n<\/tr>\n<tr>\n<td>Study real-world behavior without random assignment<\/td>\n<td>Quasi-experimental<\/td>\n<\/tr>\n<tr>\n<td>Describe a phenomenon, no causal claim needed<\/td>\n<td>Observational or descriptive<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><span class=\"ez-toc-section\" id=\"Step_2_Check_feasibility\"><\/span>Step 2: Check feasibility.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Can participants be randomly assigned. If yes, true experimental design is usually the stronger option.<\/li>\n<li>Is the setting a lab or the field. Labs support tighter control; field settings support more realistic conditions.<\/li>\n<li>Are there ethical limits on withholding a treatment. If so, randomization may not be possible.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Step_3_Weigh_resources_against_rigor\"><\/span>Step 3: Weigh resources against rigor.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>True experimental designs with 3 or more groups, such as the Solomon 4-group design, need larger samples and more time.<\/li>\n<li>Pre-experimental designs are fast and low-cost but offer the weakest causal evidence.<\/li>\n<li>Quasi-experimental designs balance cost and rigor when randomization is not an option.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Step_4_Weigh_validity_trade-offs\"><\/span>Step 4: Weigh validity trade-offs.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<table>\n<thead>\n<tr>\n<td><strong>Priority<\/strong><\/td>\n<td><strong>Favors<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Strongest internal validity<\/td>\n<td>True experimental, lab setting<\/td>\n<\/tr>\n<tr>\n<td>Strongest external validity<\/td>\n<td>Quasi-experimental, field setting<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Rule of thumb: pick the design offering the strongest possible causal evidence within the ethical, practical, and resource limits of the study, rather than defaulting to the most rigorous option available.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_to_Choose_Between_Quasi-Experimental_and_Experimental_Designs\"><\/span>How to Choose Between Quasi-Experimental and Experimental Designs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The central question is whether random assignment is possible.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Step_1_Check_for_barriers_to_randomization\"><\/span>Step 1: Check for barriers to randomization.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Ethical barriers: withholding a known beneficial treatment would cause harm, common in medicine and public health.<\/li>\n<li>Practical barriers: the researcher cannot control who receives an intervention, such as a workplace policy change or a natural disaster.<\/li>\n<li>Structural barriers: groups already exist, such as comparing 2 schools or 2 hospitals with different practices.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Step_2_Compare_the_2_options_directly\"><\/span>Step 2: Compare the 2 options directly.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<table>\n<thead>\n<tr>\n<td><strong>Factor<\/strong><\/td>\n<td><strong>True experimental<\/strong><\/td>\n<td><strong>Quasi-experimental<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Random assignment<\/td>\n<td>Required<\/td>\n<td>Not used<\/td>\n<\/tr>\n<tr>\n<td>Internal validity<\/td>\n<td>Higher<\/td>\n<td>Lower<\/td>\n<\/tr>\n<tr>\n<td>External validity<\/td>\n<td>Often lower<\/td>\n<td>Often higher<\/td>\n<\/tr>\n<tr>\n<td>Time and cost<\/td>\n<td>Higher<\/td>\n<td>Lower<\/td>\n<\/tr>\n<tr>\n<td>Risk of confounding<\/td>\n<td>Lower<\/td>\n<td>Higher<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><span class=\"ez-toc-section\" id=\"Step_3_Match_the_decision_to_the_situation\"><\/span>Step 3: Match the decision to the situation.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Choose true experimental design when randomization is possible, ethical, and resources allow for it.<\/li>\n<li>Choose quasi-experimental design when the setting, timeline, or existing groups make randomization impractical.<\/li>\n<li>Strengthen a quasi-experimental design with a comparison group, a pretest, and statistical controls for known confounders whenever possible.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Step_4_Confirm_the_trade-off_is_acceptable\"><\/span>Step 4: Confirm the trade-off is acceptable.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Ask whether the study needs the strongest possible causal claim, which favors a true experiment.<\/li>\n<li>Ask whether the study needs results that generalize to real-world conditions, which favors a quasi-experiment.<\/li>\n<\/ul>\n<p>The right choice depends on which type of validity, internal or external, matters more for the specific research question.<\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Steps_to_Design_an_Experiment\"><\/span><strong>Steps to Design an Experiment<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A practical, step-by-step approach lowers the risk of a flawed design and saves time during analysis. Each step builds on the one before it, so skipping ahead, for example choosing a statistical test before defining the hypothesis, often forces researchers to redo earlier work.<\/p>\n<ol>\n<li><strong>Define the independent and dependent variables clearly.<\/strong> State exactly what will be manipulated and exactly what will be measured, using terms specific enough that another researcher could replicate the setup.<\/li>\n<li><strong>Write a specific, testable hypothesis<\/strong>, including a null version (no effect) and an alternative version (an effect exists).<\/li>\n<li><strong>Choose a design type<\/strong>, pre-experimental, quasi-experimental, or true experimental, based on what is feasible and ethical given the population and setting.<\/li>\n<li><strong>List possible confounding and extraneous variables<\/strong> and decide in advance how each will be controlled, either by holding it constant or by measuring and adjusting for it statistically.<\/li>\n<li><strong>Calculate the sample size<\/strong> needed using a statistical power analysis, so the study has a real chance of detecting an effect if one exists.<\/li>\n<li><strong>Randomize participants to groups<\/strong>, and apply single, double, or triple blinding where appropriate to reduce bias.<\/li>\n<li><strong>Operationalize the dependent variable<\/strong>, turning an abstract concept into something measurable with a defined instrument or scale.<\/li>\n<li><strong>Collect data and select the statistical test<\/strong> that matches the design and the type of data gathered.<\/li>\n<\/ol>\n<p>In fields such as chemistry and engineering, researchers often use formal design of experiments methods, including factorial designs and response surface methodology, to plan several variables at once and optimize a process in fewer trials than testing one variable at a time would require.<\/p>\n<p><em>See also: <a href=\"https:\/\/researcher.life\/blog\/article\/what-is-a-lab-report-format-and-examples\/\">What is a Lab Report? Format and Examples<\/a><\/em><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Randomization_and_Blinding_in_Experimental_Research\"><\/span><strong>Randomization and Blinding in Experimental Research<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Randomization and blinding are 2 separate tools researchers use to reduce bias once a design type has been chosen.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Types_of_Randomization\"><\/span><strong>Types of Randomization<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Simple randomization: every participant has an equal, independent chance of being placed in any group, often using a random number generator.<\/li>\n<li>Stratified or block randomization: participants are first grouped by a shared trait, such as age or severity, and then randomly assigned within each group.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Types_of_Blinding\"><\/span><strong>Types of Blinding<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Single-blind: participants do not know which group they are in.<\/li>\n<li>Double-blind: neither participants nor the researchers collecting data know the group assignments.<\/li>\n<li>Triple-blind: participants, researchers, and the team analyzing the data are all unaware of group assignments.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"What_Are_Confounding_Variables_and_Threats_to_Validity\"><\/span><strong>What Are Confounding Variables and Threats to Validity?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A confounding variable is a third factor connected to both the independent and dependent variable, which can make a result look like it was caused by the treatment when it was not.<\/p>\n<p>Several other threats to validity can also distort results if they are not planned for in advance.<\/p>\n<table width=\"624\">\n<thead>\n<tr>\n<td width=\"113\"><strong>Threat<\/strong><\/td>\n<td width=\"153\"><strong>What it means<\/strong><\/td>\n<td width=\"173\"><strong>Example<\/strong><\/td>\n<td width=\"184\"><strong>How to reduce it<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td width=\"113\">Confounding variable<\/td>\n<td width=\"153\">A third variable affects both the cause and the outcome<\/td>\n<td width=\"173\">Diet changes during an exercise study also affect weight loss<\/td>\n<td width=\"184\">Control statistically or hold the variable constant<\/td>\n<\/tr>\n<tr>\n<td width=\"113\">Historical event<\/td>\n<td width=\"153\">An outside event between measurements affects the result<\/td>\n<td width=\"173\">A new diet trend spreads on social media during a weight-loss study<\/td>\n<td width=\"184\">Include a control group tested over the same period<\/td>\n<\/tr>\n<tr>\n<td width=\"113\">Maturation<\/td>\n<td width=\"153\">Natural change over time affects the outcome<\/td>\n<td width=\"173\">Muscle mass increases with age regardless of training<\/td>\n<td width=\"184\">Compare against a control group of similar age<\/td>\n<\/tr>\n<tr>\n<td width=\"113\">Regression to the mean<\/td>\n<td width=\"153\">Extreme initial scores move closer to average on retesting<\/td>\n<td width=\"173\">Very overweight participants show improvement regardless of treatment<\/td>\n<td width=\"184\">Use a control group and repeated baseline measures<\/td>\n<\/tr>\n<tr>\n<td width=\"113\">Selection bias<\/td>\n<td width=\"153\">Groups differ in ways unrelated to treatment<\/td>\n<td width=\"173\">Volunteers in a wellness program are already healthier<\/td>\n<td width=\"184\">Use random assignment where possible<\/td>\n<\/tr>\n<tr>\n<td width=\"113\">Attrition<\/td>\n<td width=\"153\">Participants drop out unevenly across groups<\/td>\n<td width=\"173\">Less motivated participants leave the treatment group<\/td>\n<td width=\"184\">Track dropout reasons and compare completers with dropouts<\/td>\n<\/tr>\n<tr>\n<td width=\"113\">Testing effect<\/td>\n<td width=\"153\">Taking a pretest changes performance on a posttest<\/td>\n<td width=\"173\">Familiarity with a memory test improves the second score<\/td>\n<td width=\"184\">Use a posttest-only design or a Solomon 4-group design<\/td>\n<\/tr>\n<tr>\n<td width=\"113\">Instrumentation<\/td>\n<td width=\"153\">A measurement tool changes between tests<\/td>\n<td width=\"173\">A survey is reworded between pretest and posttest<\/td>\n<td width=\"184\">Keep the same instrument and procedure throughout<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Types_of_Validity_in_Experimental_Research\"><\/span><strong>Types of Validity in Experimental Research<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<table width=\"624\">\n<thead>\n<tr>\n<td width=\"173\"><strong>Validity type<\/strong><\/td>\n<td width=\"451\"><strong>What it means<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td width=\"173\">Internal validity<\/td>\n<td width=\"451\">Confidence that the treatment, not another factor, caused the result.<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">External validity<\/td>\n<td width=\"451\">The extent to which findings apply beyond the study&#8217;s sample and setting.<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">Construct validity<\/td>\n<td width=\"451\">Whether the study actually measures the concept it claims to measure.<\/td>\n<\/tr>\n<tr>\n<td width=\"173\">Statistical conclusion validity<\/td>\n<td width=\"451\">Whether the statistical analysis supports the conclusions drawn.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Sample_Size_and_Statistical_Power\"><\/span><strong>Sample Size and Statistical Power<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Statistical power is the probability that a study detects a true effect when one exists. Power depends on sample size, effect size, and the significance level chosen, usually 0.05.<\/p>\n<p>Larger samples and larger expected effects increase power. Researchers often use power analysis software, such as G*Power, to estimate the minimum sample size needed before starting an experiment.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Statistical_Tests_Used_to_Analyze_Experimental_Data\"><\/span><strong>Statistical Tests Used to Analyze Experimental Data<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The right statistical test depends on the number of groups, the design type, and the type of data collected.<\/p>\n<table width=\"624\">\n<thead>\n<tr>\n<td width=\"173\"><strong>Test<\/strong><\/td>\n<td width=\"451\"><strong>When to use it<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td width=\"173\"><a href=\"https:\/\/www.editage.com\/blog\/t-test-definition-assumptions-formula-calculation\/\">t-test<\/a><\/td>\n<td width=\"451\">Comparing means between 2 groups.<\/td>\n<\/tr>\n<tr>\n<td width=\"173\"><a href=\"https:\/\/www.editage.com\/blog\/anova-types-uses-assumptions-a-quick-guide-for-biomedical-researchers\/\">ANOVA<\/a><\/td>\n<td width=\"451\">Comparing means across 3 or more groups or conditions.<\/td>\n<\/tr>\n<tr>\n<td width=\"173\"><a href=\"https:\/\/www.editage.com\/blog\/what-is-regression-and-types-of-regression-for-biomedical-researchers\/\">Regression<\/a><\/td>\n<td width=\"451\">Modeling the relationship between 1 or more predictors and an outcome.<\/td>\n<\/tr>\n<tr>\n<td width=\"173\"><a href=\"https:\/\/www.editage.com\/blog\/chi-square-test-types-explained-for-biomedical-researchers\/\">Chi-square test<\/a><\/td>\n<td width=\"451\">Comparing frequencies or proportions between categorical groups.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p>Common software for these analyses includes R, SPSS, and JASP, along with G*Power for planning sample size in advance.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Worked_Example_Designing_a_Simple_Experiment\"><\/span><strong>Worked Example: Designing a Simple Experiment<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Suppose a university wants to know whether a new 30-minute revision technique improves exam scores compared with regular self-study.<\/p>\n<ul>\n<li>Variables: the independent variable is revision technique, new method or regular study, and the dependent variable is exam score.<\/li>\n<li><a href=\"https:\/\/researcher.life\/blog\/article\/how-to-write-a-research-hypothesis-definition-types-examples\/\">Hypothesis<\/a>: the null hypothesis states there is no difference in scores between groups, and the alternative hypothesis states the new technique produces higher scores.<\/li>\n<li>Design: a true experimental, between-subjects design with 1 treatment group and 1 control group.<\/li>\n<li>Control: prior GPA and study time are recorded and compared between groups to check they are similar at baseline.<\/li>\n<li>Sample size: a power analysis suggests 40 students per group are needed to detect a moderate effect.<\/li>\n<li>Randomization: students are randomly assigned to the treatment or control group using a random number generator.<\/li>\n<li>Measurement: exam score is operationalized as the percentage correct on a standardized 50-item test.<\/li>\n<li>Analysis: an independent-samples t-test compares mean scores between the 2 groups.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Common_Mistakes_in_Experimental_Research_Design\"><\/span><strong>Common Mistakes in Experimental Research Design<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Most flawed experiments fail for a small set of predictable reasons. Knowing them in advance makes them easier to catch before data collection starts, when fixes are still cheap.<\/p>\n<ul>\n<li><strong>Testing a hypothesis that is not logically sound or not clearly stated.<\/strong> A vague or untestable hypothesis makes it impossible to know what result would actually confirm or refute it.<\/li>\n<li><strong>Skipping a thorough literature review.<\/strong> Without one, researchers risk repeating a study that has already been done, or missing a known confound that earlier work has already identified.<\/li>\n<li><strong>Choosing the wrong statistical test for the design or the data type.<\/strong> Using a t-test on 3 or more groups, or applying a test built for continuous data to categorical data, produces results that cannot be trusted.<\/li>\n<li><strong>Leaving the research problem too broad or poorly defined.<\/strong> A vague problem statement makes it hard to pick variables, a sample, or a design that actually answers the question.<\/li>\n<li><strong>Ignoring likely limitations instead of planning for them.<\/strong> Every design has constraints, and failing to state them upfront weakens the credibility of the conclusions later.<\/li>\n<li><strong>Overlooking ethical review, informed consent, or participant safety.<\/strong> This can invalidate a study entirely, regardless of how sound the statistical design is.<\/li>\n<li><strong>Using a sample size that is too small to detect a real effect.<\/strong> An underpowered study can produce a false negative, making a real effect look like no effect at all.<\/li>\n<li><strong>Failing to plan for confounding variables before data collection begins.<\/strong> Confounds identified after the fact usually cannot be corrected, only acknowledged as a limitation.<\/li>\n<\/ul>\n<p><em>See also: <a href=\"https:\/\/researcher.life\/blog\/article\/best-ai-tools-for-stem-research\/\">Best AI Tools for STEM Research<\/a><\/em><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Experimental_Research_vs_Other_Research_Designs\"><\/span><strong>Experimental Research vs Other Research Designs<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<table width=\"624\">\n<thead>\n<tr>\n<td width=\"153\"><strong>Feature<\/strong><\/td>\n<td width=\"133\"><strong>Experimental<\/strong><\/td>\n<td width=\"173\"><strong>Quasi-experimental<\/strong><\/td>\n<td width=\"164\"><strong>Observational<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td width=\"153\">Random assignment<\/td>\n<td width=\"133\">Yes<\/td>\n<td width=\"173\">No<\/td>\n<td width=\"164\">No<\/td>\n<\/tr>\n<tr>\n<td width=\"153\">Control group<\/td>\n<td width=\"133\">Always<\/td>\n<td width=\"173\">Sometimes<\/td>\n<td width=\"164\">Rarely<\/td>\n<\/tr>\n<tr>\n<td width=\"153\">Manipulation of variables<\/td>\n<td width=\"133\">Yes<\/td>\n<td width=\"173\">Yes, but not randomized<\/td>\n<td width=\"164\">No<\/td>\n<\/tr>\n<tr>\n<td width=\"153\">Strength of causal evidence<\/td>\n<td width=\"133\">Strongest<\/td>\n<td width=\"173\">Moderate<\/td>\n<td width=\"164\">Weakest<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Advantages_and_Disadvantages_of_Experimental_Research_Design\"><\/span><strong>Advantages and Disadvantages of Experimental Research Design<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Advantages\"><\/span><strong>Advantages<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Gives researchers a high level of control over variables.<\/li>\n<li>Produces specific, focused conclusions.<\/li>\n<li>Allows other researchers to duplicate the study and check results.<\/li>\n<li>Supports strong causal claims between variables.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Disadvantages\"><\/span><strong>Disadvantages<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Carries a risk of human error and bias during manipulation.<\/li>\n<li>Can be costly and time-consuming, especially with large samples.<\/li>\n<li>Raises ethical questions when withholding a helpful treatment or applying a harmful one.<\/li>\n<li>May not be practical for large-scale or long-term questions.<\/li>\n<li>Laboratory settings can limit how well results generalize to real life.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Ethical_Considerations_in_Experimental_Research\"><\/span><strong>Ethical Considerations in Experimental Research<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Informed consent: participants agree in writing after understanding the study&#8217;s purpose and procedures.<\/li>\n<li>Voluntary participation: no participant is pressured or coerced into taking part.<\/li>\n<li>Confidentiality: personal data is protected and cannot be traced back to individual participants.<\/li>\n<li>Minimizing deception: researchers disclose the study&#8217;s true purpose whenever possible.<\/li>\n<li>Accurate reporting: results are reported honestly, including unexpected or negative findings.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Checklist_for_a_Sound_Experimental_Research_Design\"><\/span><strong>Checklist for a Sound Experimental Research Design<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Is the hypothesis specific and testable.<\/li>\n<li>Is the design type appropriate for the research question and setting.<\/li>\n<li>Have confounding variables been identified and controlled.<\/li>\n<li>Has sample size been calculated using power analysis.<\/li>\n<li>Is the randomization method appropriate and documented.<\/li>\n<li>Is the dependent variable clearly operationalized.<\/li>\n<li>Has the statistical test been matched to the design and data type.<\/li>\n<li>Has the study passed ethical review, including informed consent.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span><strong>Frequently Asked Questions<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"What_Is_the_Difference_Between_Experimental_and_Quasi-Experimental_Research_Design\"><\/span><strong>What Is the Difference Between Experimental and Quasi-Experimental Research Design?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The main difference is random assignment. Experimental design randomly assigns participants to groups, while quasi-experimental design does not. Quasi-experimental studies are used when randomization is not ethical or practical, such as in field or public health settings.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_Many_Participants_Are_Needed_for_a_True_Experimental_Design\"><\/span><strong>How Many Participants Are Needed for a True Experimental Design?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The right number depends on a statistical power analysis, which factors in the expected effect size, the significance level, and the desired power, usually 0.80. Small effects need larger samples, while large effects can be detected with fewer participants.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_Is_the_Difference_Between_Internal_Validity_and_External_Validity\"><\/span><strong>What Is the Difference Between Internal Validity and External Validity?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Internal validity is confidence that the treatment caused the result. External validity is how well the results apply beyond the study&#8217;s sample and setting. Laboratory studies often have higher internal validity, while field studies often have higher external validity.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_Experimental_Research_Be_Conducted_Without_a_Control_Group\"><\/span><strong>Can Experimental Research Be Conducted Without a Control Group?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Yes, but it weakens the design. Pre-experimental designs, such as the one-group pretest-posttest design, often skip a control group, which makes it harder to rule out other explanations for the result, such as maturation or historical events.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_Is_the_Difference_Between_a_Within-Subjects_and_a_Between-Subjects_Design\"><\/span><strong>What Is the Difference Between a Within-Subjects and a Between-Subjects Design?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>In a within-subjects design, each participant experiences every condition. In a between-subjects design, each participant experiences only 1 condition. Within-subjects designs need fewer participants but carry a higher risk of order effects.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Why_Is_Random_Assignment_Important_in_Experimental_Research\"><\/span><strong>Why Is Random Assignment Important in Experimental Research?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Random assignment gives every participant an equal chance of being placed in any group, which helps balance known and unknown differences between groups. This reduces selection bias and strengthens the case that the treatment caused the result.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Is_Quasi-Experimental_Design_Considered_Scientific_Research\"><\/span><strong>Is Quasi-Experimental Design Considered Scientific Research?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Yes. Quasi-experimental design is a recognized scientific method used widely in nursing, education, and public health research. It is a practical option when random assignment is not feasible, though it carries a higher risk of confounding than true experimental design.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_Software_Is_Used_to_Analyze_Experimental_Research_Data\"><\/span><strong>What Software Is Used to Analyze Experimental Research Data?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Common tools include R, SPSS, and JASP for statistical analysis, and G*Power for calculating sample size before a study begins. The right choice depends on the statistical test, the sample size, and whether a free or licensed option is needed.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"References\"><\/span><strong>References<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ol>\n<li>Capili, Bernadette, and Joyce K. Anastasi. &#8220;An Introduction to the Quasi-Experimental Design (Nonrandomized Design).&#8221; American Journal of Nursing, vol. 124, no. 11, 2024, pp. 50-52. DOI: 10.1097\/01.NAJ.0001081740.74815.20. PMC11741180. https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC11741180\/<\/li>\n<li>Benedetti, Barbara, Vicky Caponigro, and Francisco Ardini. &#8220;Experimental Design Step by Step: A Practical Guide for Beginners.&#8221; Critical Reviews in Analytical Chemistry, vol. 52, no. 5, 2020. DOI: 10.1080\/10408347.2020.1848517. https:\/\/pubmed.ncbi.nlm.nih.gov\/33258692\/<\/li>\n<li>Shuster, Jonathan J. &#8220;Design and Analysis of Experiments.&#8221; Methods in Molecular Biology, vol. 404, 2007, pp. 235-259. DOI: 10.1007\/978-1-59745-530-5_12. https:\/\/pubmed.ncbi.nlm.nih.gov\/18450053\/<\/li>\n<\/ol>\n<p><em>This article was originally published on December 18, 2024, and updated on July 29, 2026.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Key Takeaways: Experimental research design tests cause and effect by manipulating an independent variable and measuring change in a dependent variable. The 3 core categories,<\/p>\n","protected":false},"author":42,"featured_media":10705,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_editorskit_title_hidden":false,"_editorskit_reading_time":0,"_editorskit_is_block_options_detached":false,"_editorskit_block_options_position":"{}","footnotes":""},"categories":[63,1],"tags":[921,922],"class_list":["post-10704","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research-tips","category-researcher-life","tag-experimental-research","tag-experimental-research-design"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is Experimental Research Design? Definition, Types, and Examples | Researcher.Life<\/title>\n<meta name=\"description\" content=\"What is experimental research design? 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