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 researcher can conclude that:
A) there is no statistically significant evidence that students who use the computer training will do any better than students using the standard methods.
B) every student who used the computer program scored higher than any student who did not use the program.
C) there is a statistically significant difference between scores of those who had computerized algebra training and those who had standard teaching methods.
D) both b and c

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.The researcher can conclude that:
A) there is no statistically significant evidence that students who use the computer training will do any better than students using the standard methods.
B) every student who used the computer program scored higher than any student who did not use the program.
C) there is a statistically significant difference between scores of those who had computerized algebra training and those who had standard teaching methods.
D) both b and c

Quizplus · Accepted Answer

To determine if there is a statistically significant difference between the two groups, a hypothesis test needs to be conducted. This requires calculating the mean and standard deviation for each group, and then using a t-test to compare the means. However, just from looking at the scores, it is clear that there is a range of scores in each group, with some overlap. Therefore, it is not accurate to choose B, as there are some students who scored lower with the computer program than those who did not use it. So, the best choice is C, as there is evidence that the means of the two groups are different.

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