The Number of Degrees of Freedom Associated with the T-Test

Short Answer

The number of degrees of freedom associated with the t-test, when the data are gathered from a matched pairs experiment with 40 pairs, is: $\begin{array}{|l|l|}\hline\text { A. } & 38 . \\\hline \text { B. } & 39 . \\\hline \text { C. } & 1 . \\\hline \text { D. } & 2 . \\\hline\end{array}$