Exhibit 7-3: a Researcher Is Examining the Effects of a Computer-Based

Exhibit 7-3: A researcher is examining the effects of a computer-based training program designed to teach algebra.The researcher randomly selects subjects for two groups and gives one group the computer training and the other standard teaching methods to see if the results of the two methods differ.The following scores are from the subjects' final test.
$\begin{array}{ll}{\text {CBT }}{} & \text {Control }\\ 52 & 65 \\ 55 & 45 \\ 56 & 47 \\ 53 & 46 \\ 50 & 47 \\ 49 & 33 \\ 52 & 39 \\ 53 & 49\end{array}$
-Refer to Exhibit 7-3.The degrees of freedom for the test are the

A) number of rows -1 time the number of columns -1.
B) number of pairs of numbers -1.
C) total number of cases -2.
D) None of these are true.