Suppose a study is done in which the experimental and control groups both get pretests and posttests.Which of the following is the best statistical procedure?
A)Conduct a paired-samples t-test separately for each group to see whether the experimental group's improvement is more statistically significant than the control group's improvement
B)Conduct an independent-samples t-test that compares the posttest means only.
C)Conduct an independent-samples t-test that compares the changes scores in the two groups.
D)All of these are equally acceptable.

Question

Quizplus · Accepted Answer

Conducting an independent-samples t-test that compares the change scores in the two groups is the best choice as it allows for a direct comparison of the difference between pretest and posttest scores for both the experimental and control groups. This method is more sensitive than comparing posttest means only (option B) because it takes into account any differences in pretest scores between the two groups. Conducting paired-samples t-tests separately for each group (option A) does not allow for a direct comparison between the groups and may not detect any differences between them.

Suppose a Study Is Done in Which the Experimental and Control