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If all other factors are held constant, which one of the following would produce the narrowest width for a confidence interval?

A

An $85\%$ confidence interval based on a sample size of $30$.

B

A $95\%$ confidence interval based on a sample size of $30$.

C

An $85\%$ confidence interval based on a sample size of $90$.

D

A $95\%$ confidence interval based on a sample size of $90$.

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