Social Studies, 29.01.2020 03:50 cdgood12

An experimenter tests the hypothesis that physical exercise improves 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 exercise
b. the day of the week
c. the hypothesis
d. the mood (degree of happiness)

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An experimenter tests the hypothesis that physical exercise improves mood. subjects in the experimen...

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