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The Following MINITAB Output Display Presents a 95% Confidence Interval

question 33

Multiple Choice

The following MINITAB output display presents a 95% confidence interval for the difference between two means.
$\begin{array} { l r r r c } & \mathrm { N } & \text { Mean } & \text { StDev } & \text { SE Mean } \\ \text { A } & 14 & 136.895 & 22.382 & 5.982 \\ \text { B } & 10 & 115.675 & 27.816 & 8.796 \end{array}$
Difference $= m u ( A ) - m u ( B )$
Estimate for difference: $\quad 21.220$
$The following MINITAB output display presents a 95% confidence interval for the difference between two means. \begin{array} { l r r r c } & \mathrm { N } & \text { Mean } & \text { StDev } & \text { SE Mean } \\ \text { A } & 14 & 136.895 & 22.382 & 5.982 \\ \text { B } & 10 & 115.675 & 27.816 & 8.796 \end{array} Difference = m u ( A ) - m u ( B ) Estimate for difference: \quad 21.220 How many degrees of freedom did MINITAB use? A) 41.698 B) 24 C) 17 D) 21.22$

How many degrees of freedom did MINITAB use?

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