In Developing an Interval Estimate for a Population Mean, the Population

Short Answer

In developing an interval estimate for a population mean, the population standard deviation $\sigma$ was assumed to be 10. The interval estimate was 50.92 ± 2.14. Had $\sigma$ equaled 20, the interval estimate would have been: $\begin{array}{|l|l|}\hline \text { A. } & 60.92 \pm 2.14 . \\\hline \text { B. } & 50.92 \pm 12.14 \\\hline \text { C. } & 101.84 \pm 4.28 \\\hline \text { D. } & 50.92 \pm 4.28 . \\\hline\end{array}$