![]() When extraneous variables are uncontrolled, it’s hard to determine the exact effects of the independent variable on the dependent variable, because the effects of extraneous variables may mask them. Participants in the control group are asked to wear a casual coat during the study.Īll participants are given a scientific knowledge quiz, and their scores are compared between groups.Participants in the experimental group are asked to wear a lab coat during the study.You manipulate the independent variable by splitting participants into two groups: You recruit students from a university to participate in the study. Example: Experimental studyIn a study on mental performance, you test whether wearing a white lab coat, your independent variable, improves scientific reasoning, your dependent variable. In an experiment, you manipulate an independent variable to study its effects on a dependent variable. Frequently asked questions about extraneous variablesĮxtraneous variables can threaten the internal validity of your study by providing alternative explanations for your results.Types and controls of extraneous variables.
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