Question

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

Answer #1

Z for 90% confidence interval = Z_{0.05} = 1.645

confidence interval

= (3.0906 , 3.1894)

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