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Back to 8.1 A Single Population Mean Using the Normal Distribution

8.1 Exercise 9

Avg difficulty 2.5

Refer back to the pizza-delivery Try It exercise. The mean delivery time is 36 minutes and the population standard deviation is six minutes. Assume the sample size is changed to 50 restaurants with the same sample mean. Find a 90 percent confidence interval estimate for the population mean delivery time.

OpenStax Statistics, 8.1 A Single Population Mean Using the Normal Distribution, exercise 9

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