For a population data set, 12 5 a How large a sample should be selected so that the margin of error of estimate for a 99 confidence interval for is 2 50 b How large a sample should be selected so that the margin of error of estimate for a 96 confidence interval for is 3 20

Question: For a population data set, = 12.5 a. How large a sample should be selected so that the margin of error of estimate for

For a population data set, σ = 12.5
a. How large a sample should be selected so that the margin of error of estimate for a 99% confidence interval for µ is 2.50?
b. How large a sample should be selected so that the margin of error of estimate for a 96% confidence interval for µ is 3.20?

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