![]() If convenient, use technology to find the z-score. If the area is halfway between two entries, use the z-score halfway between the corresponding z-scores. ![]() If the area is not in the table, use the entry closest to the area. Suppose that our sample has a mean of \displaystyle\overline = 1. Use the standard normal table to find the z-score that corresponds to the given percentile. A confidence interval for a population mean with a known standard deviation is based on the fact that the sample means follow an approximately normal distribution.
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