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The width of a confidence interval estimate for a population mean when the population standard deviation...

The width of a confidence interval estimate for a population mean when the population standard deviation is known will

(A)   become narrower if the size of the sample being used is increased and the confidence level is unchanged.

(B)    not change if only the sample size is increased.

(C)    become wider if the sample size remains the same and the confidence level decreases.

(D)   become narrower if the size of the sample is decreased and the confidence level is unchanged.

(E)    become wider if the sample size increases and the confidence level is unchanged.

Math   Statistics-And-Probability   
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