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A random sample of fifty dash nine ​200-meter swims has a mean time of 3.14 minutes...

A random sample of fifty dash nine ​200-meter swims has a mean time of 3.14 minutes and the population standard deviation is 0.09 minutes. Construct a 90​% confidence interval for the population mean time. Interpret the results. The 90​% confidence interval is

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Answer #1

Z for 90% confidence interval = Z0.05 = 1.645

confidence interval

                              

                              

                               = (3.0906 , 3.1894)

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