The Following MINITAB Output Presents a Confidence Interval for a Population

question 1

Multiple Choice

The following MINITAB output presents a confidence interval for a population mean. $$\begin{array} { c r r r c c } \hline \text { Variable } & \mathrm { N } & \text { Mean } & \text { StDev } & \text { SE Mean } & 99 \% \mathrm { CI } \\\mathrm { x } & 67 & 71.0754 & 26.3867 & 3.2236 & ( 62.525,79.626 ) \\\hline\end{array}$$ How many degrees of freedom are there?

• A) 66
• B) 3.2236
• C) 68
• D) 67