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The manager of the service department of a local car dealership has noted that the service...

The manager of the service department of a local car dealership has noted that the service times of a sample of 15 new automobiles have a sample variance of S2 = 16.

A 95% confidence interval estimate for the population variance of service times for all their new automobiles is:

A 95% confidence interval estimate for the population standard deviation of service times for all their new automobiles is:

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