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a Determine the sample size necessary to estimate a population

a. Determine the sample size necessary to estimate a population mean to within 1 with 90% confidence given that the population standard deviation is 10.

b. Suppose that the sample mean was calculated as 150. Estimate the population mean with 90% confidence.

b. Suppose that the sample mean was calculated as 150. Estimate the population mean with 90% confidence.

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