Question: A population has standard deviation = 9.2. a. How large a sample must be drawn so that a 92% confidence interval for will

A population has standard deviation σ = 9.2.

a. How large a sample must be drawn so that a 92% confidence interval for μ will have a margin of error equal to 0.8?

b. If the required margin of error were 1.4, would the necessary sample size be larger or smaller?

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