An Experimenter Tests the Hypothesis That Physical Exercise Improves People's

question 37

Multiple Choice

An experimenter tests the hypothesis that physical exercise improves people's mood.Subjects in the experimental group participate on Monday and Tuesday and those in the control group on Wednesday and Thursday.What is the extraneous (confounding) variable?

• A) the hypothesis
• B) the day of the week
• C) the exercise
• D) the mood (degree of happiness)

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