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

An experimenter tests the hypothesis that physical exercise helps people's mood (makes them happier) . 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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