A person selects a random sample of 15 credit cards and determines the annual interest rate, in

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A person selects a random sample of 15 credit cards and determines the annual interest rate, in percent, of each. The sample mean is 12.42 with a sample standard deviation of 1.3. Construct a 95% confidence interval for the mean credit card annual interest rate, assuming that the rates are approximately normally distributed.

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Elementary Statistics

ISBN: 9781259969454

3rd Edition

Authors: William Navidi, Barry Monk

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