An experimenter tests the hypothesis that physical exercise helps people's mood...

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An experimenter tests the hypothesis that physical exercise helps people's mood (makes them happier). Subjects in the ex perimental group participate on Monday and Tuesday and those in the control an Wednesday and Thursday. What is the extraneous (confounding) variable?

A. The exercise

B. The mood (degree of happiness)

C. The hypothesis

D. Day of the week

Answer: Option D

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