Exhibit 7-4: A group of researchers has developed a method that they hypothesize will improve physics test scores.They randomly selected nine students to participate in their study.The nine students were administered an ACT test, trained in the new method, and then administered an alternate form of the ACT test.The following data are their scores:
$ \begin{array}{lll}\text {Subject } & {\text {Test 1 }}{} & \text {Test 2 } \ 1 & 20 & 19 \ 2 & 20 & 20 \ 3 & 24 & 21 \ 4 & 24 & 24 \ 5 & 24 & 22 \ 6 & 17 & 15 \ 7 & 18 & 15 \ 8 & 18 & 16 \ 9 & 20& 18\end{array} $
-Refer to Exhibit 7-4.What test is most appropriate for this data and hypothesis?
A) Chi square
B) Correlated t-test
C) Independent t-test
D) Pearson's r

Question

Exhibit 7-4: A group of researchers has developed a method that they hypothesize will improve physics test scores.They randomly selected nine students to participate in their study.The nine students were administered an ACT test, trained in the new method, and then administered an alternate form of the ACT test.The following data are their scores:
 $ \begin{array}{lll}\text {Subject } & {\text {Test 1 }}{} & \text {Test 2 } \ 1 & 20 & 19 \ 2 & 20 & 20 \ 3 & 24 & 21 \ 4 & 24 & 24 \ 5 & 24 & 22 \ 6 & 17 & 15 \ 7 & 18 & 15 \ 8 & 18 & 16 \ 9 & 20&  18\end{array} $
-Refer to Exhibit 7-4.What test is most appropriate for this data and hypothesis?
A) Chi square
B) Correlated t-test
C) Independent t-test
D) Pearson's r

Quizplus · Accepted Answer

A correlated t-test is the most appropriate test for this data, as it involves comparing the scores of the same set of individuals before and after an intervention (in this case, before and after being trained in the new method). The other options (chi square, independent t-test, Pearson's r) are not appropriate for this type of analysis.

Exhibit 7-4: a Group of Researchers Has Developed a Method