Question

A publisher wants to estimate the mean length of time​ (in minutes) all adults spend reading newspapers. To determine this​ estimate, the publisher takes a random sample of 15 people and obtains the results below. From past​ studies, the publisher assumes sigma is 2.7 minutes and that the population of times is normally distributed. 12 12 6 9 11 12 9 9 11 10 6 6 12 6 6 Construct the​ 90% and​ 99% confidence intervals for the population mean. Which interval is​ wider? If​ convenient, use technology to construct the confidence intervals. The​ 90% confidence interval is

Answer 1

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