![]() a control group that’s given a placebo (no dosage),.You use three groups of participants that are each given a different level of the independent variable: Example: Different levels of an independent variableIn a clinical study, you investigate the effect of iron supplements (your independent variable) on energy levels (your dependent variable). This is called a between-groups or independent measures design. To do so, they often use different levels of an independent variable for different groups of participants. In experiments, researchers manipulate an independent variable to assess its effect on a dependent variable, while controlling for other variables. ![]() Random assignment is an important part of control in experimental research, because it helps strengthen the internal validity of an experiment. Frequently asked questions about random assignment.
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