A Random Sample of Size 15 Taken from a Normally

Short Answer

A random sample of size 15 taken from a normally distributed population revealed a sample mean of 75 and a sample variance of 25. The upper limit of a 95% confidence interval for the population mean would equal: $\begin{array}{|l|l|}\hline\text { A. } & 77.769 \\\hline \text { B. } & 72.231 \\\hline \text { C. } & 72.727 \\\hline \text { D. } & 77.273 \\\hline\end{array}$