Question: A population has standard deviation = 21.3. a. How large a sample must be drawn so that a 99% confidence interval for will

A population has standard deviation σ = 21.3.

a. How large a sample must be drawn so that a 99% confidence interval for μ will have a margin of error equal to 2.5?

b. If the required confidence level were 95%, would the necessary sample size be larger or smaller?

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