The sample size needed to estimate a population mean to within 2 units with a 95% confidence when the population standard deviation equals 8 is: $\begin{array}{|l|l|}
\hline\text { A. } & 9 . \
\hline \text { B. } & 61 . \
\hline \text { C. } & 62 . \
\hline \text { D. } & 8 .\\hline
\end{array}$

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The Answer of The sample size needed to estimate a population mean to within 2 units with a 95% confidence when the population standard deviation equals 8 is: $\begin{array}{|l|l|}
\hline\text { A. } & 9 . \
\hline \text { B. } & 61 . \
\hline \text { C. } & 62 . \
\hline \text { D. } & 8 .\\hline
\end{array}$

The Sample Size Needed to Estimate a Population Mean to Within