Question: 1.Count If the population standard deviation is 2.5, what sample size is needed to estimate the mean white blood cell count (in cells per microliter)

1.CountIf the population standard deviation is 2.5, 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 the sample mean is within 0.2 of the population mean.

a.For 90% confidence, the sample size = ___________________________________________

b.For 95% confidence, the sample size = ___________________________________________

c.For 99% confidence, the sample size = ___________________________________________

What happens to the sample size as the percentage of confidence increases? Why is this the case? Write one or two sentences backing up your assessment.

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