Question: Refer to the first confidence interval you calculated for the population mean duration of customer service calls. Use this confidence interval to test whether this

Refer to the first confidence interval you calculated for the population mean duration of customer service calls. Use this confidence interval to test whether this population mean differs from the following values, using level of significance α = 0.05.

a. 15 minutes

b. 20 minutes

c. 25 minutes

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