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

A population has a standard deviation

=9.2.

a)How large a sample must be drawn so that a 92% confidence interval for

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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