Find the Sample Size Required to Estimate a Population Mean With a Given Confidence Level Question Suppose the finishing times for cyclists in a race are normally distributed. If the population standard deviation is 16 minutes, what minimum sample size is needed to be 90% confident that the sample mean is within 5 minutes of the true population mean? Zo.10 Zo.05 Zo.025 Z0.01 Zo.005 1.2821.645 1.960 |2.326 2.576 Use the table above for the z-score, and be sure to round up to the nearest integer.

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