Question: What sample size is needed to estimate the mean white blood cell count (in cells per microliter) for the population of adults in the United

What sample size is needed to estimate the mean white blood cell count (in cells per microliter) for the population of adults in the United States? Assume that you want 99% confidence that the sample mean is within 0.2 of the population mean. The population standard deviation is 2.5.

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