The Sample Size Needed to Estimate a Population Mean to Within

Short Answer

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: $\begin{array}{|l|l|}\hline\text { A. } & 9 . \\\hline \text { B. } & 61 . \\\hline \text { C. } & 62 . \\\hline \text { D. } & 8 .\\\hline\end{array}$