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Back to 8.1 A Single Population Mean Using the Normal Distribution

8.1 Exercise 3

Avg difficulty 2.5

Suppose average pizza delivery times are normally distributed with an unknown population mean and a population standard deviation of 6 minutes. A random sample of 28 pizza delivery restaurants is taken and has a sample mean delivery time of 36 min.

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 3

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