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.What is the null hypothesis?
A) $\mu$CBT $ \geq $ $\mu$Control
B) $\mu$CBT $ \leq $ $\mu$Control
C) $\mu$CBT = $\mu$Control
D) None of these are true.

Question

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.What is the null hypothesis?
A) $\mu$CBT $ \geq $  $\mu$Control
B)  $\mu$CBT $ \leq $  $\mu$Control
C)  $\mu$CBT =  $\mu$Control
D) None of these are true.

Quizplus · Accepted Answer

The null hypothesis is typically stated as there being no significant difference between the two groups being compared. Therefore, the null hypothesis in this case is that the mean algebra test score for the computer-based training group (CBT) is equal to the mean algebra test score for the control group. This can be written as:  $\mu$CBT =  $\mu$Control.

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