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A population has standard deviation 17.7. Part 1 of 2 (a) How large a sample must be...

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Statistics


A population has standard deviation 17.7.

Part 1 of 2
(a) How large a sample must be drawn so that a 90% confidenceinterval for u will have a margin of error equal to 3.2?
Round the critical value to no less than three decimal places.Round the sample size up to the nearest integer.

A sample size of ___ is needed to be drawn in order to obtain a90% confidence interval with a margin of error equal to 3.2.

Part 2 of 2
(b) If the required confidence level were 99.5, would the necessarysample size be larger or smaller

(larger/smaller), because the confidence level is(higher/lower).

Answer & Explanation Solved by verified expert
4.4 Ratings (836 Votes)
Solution Given thatstandard deviation 177margin of error E 32At 90    See Answer
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