The Following MINITAB Output Display Presents a 95% Confidence Interval

Multiple Choice

The following MINITAB output display presents a 95% confidence interval for the difference between two means. $\begin{array}{rrrrc} & \mathrm{N} & \text { Mean } & \text { StDev } & \text { SE Mean } \\\mathrm{A} & 13 & 111.071 & 22.131 & 6.138 \\\mathrm{~B} & 15 & 97.224 & 26.446 & 6.828\end{array}$




How many degrees of freedom did MINITAB use?

A) 26
B) 13.847
C) 28
D) 35.992