State the hypotheses necessary to test whether the two populations differ from each other. b) Complete the test at the .05 and .01 levels of significance and state your conclusions.

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Following are data from a hypothetical study of exercise and depression. People were randomly assigned to
exercise or not over the course of two months (higher scores reflect higher levels of depression at the end of
the study).
Exercise: 19, 7, 24, 15, 14, 16, 25, 12, 22 No exercise: 25, 31, 26, 33, 36, 25, 34, 42
a) State the hypotheses necessary to test whether the two populations differ from each other.
b) Complete the test at the .05 and .01 levels of significance and state your conclusions.

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