Question: A population has standard deviation = 17.3. a. How large a sample must be drawn so that a 95% confidence interval for will

A population has standard deviation σ = 17.3.

a. How large a sample must be drawn so that a 95% confidence interval for μ will have a margin of error equal to 1.4?

b. If the required confidence level were 98%, would the necessary sample size be larger or smaller?

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