SOLUTION: What sample size is needed to estimate the mean white blood cell count (in cell micro-liter)? For the population of adults in the United States? Assume that you want 99% confide

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Question 758549: What sample size is needed to estimate the mean white blood cell count (in cell micro-liter)?
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. Show formula please,thank you.
Answer by reviewermath(1029) About Me  (Show Source):
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Q:
What sample size is needed to estimate the mean white blood cell count (in cell micro-liter)?
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. Show formula please,thank you.
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A:
Enter =roundup((-normsinv((1-.99)/2)*2.5/0.2)^2,0) on EXCEL,the result is highlight%281037%29.