Question: Refer to the previous exercise a Explain how the result of

Refer to the previous exercise.
a. Explain how the result of the 95% confidence interval shown in the table agrees with the test decision using the 0.05 significance level.
b. Suppose you instead wanted to perform a one-sided test, because the study predicted that the increase in sales would be higher with coupons. Explain why the normal population assumption may possibly be problematic.

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