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A restaurant that delivers pizza wants to study its delivery time performance. The manager collects a...

A restaurant that delivers pizza wants to study its delivery time performance. The manager collects a sample of 100 deliveries and finds a 90% confidence interval for delivery times to be 24–29 minutes. Assuming that the population standard deviation was used in calculating the confidence interval, what is this standard deviation?

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Answer #1

Given, n=lvo, cougd eu ce level = 909 = = 1-0.90 - 0.10 Zalz - Zong, = 10045 (from Z- table) 90% confidence interval is (24,2

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