In a study on the relationship between physical activity and cognitive ability, Zoey hypothesizes that engagement in physical activity will predict scores on an IQ test. She randomly assigns participants to spend 5 days participating in an exercise program or 5 days relaxing at home. She also asks participants to report how well they slept each night during the study so she can control for it later. Which of the following is the confounding variable in this study?
A. Physical activity
B. IQ test scores
C. Hours slept
D. Cognitive ability
Answer: C
Psychology
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