In a pilot study, Dana wants to test the significance of the improvement in mean scores from pretest to posttest.Dana should use:
A)The one-sample t-Test.
B)The paired-samples t-Test.
C)The independent-samples t-Test.
D)An independent-samples t-Test with change scores.

Question

Quizplus · Accepted Answer

The paired-samples t-Test is appropriate for testing the significance of the improvement in mean scores from pretest to posttest because it compares the means of two related groups (pretest and posttest scores for each participant) and takes into account the correlation between them. The other options are not appropriate for this specific scenario. The one-sample t-Test compares a sample mean to a known population mean or a hypothesized mean, but in this case there is no known or hypothesized mean to compare to. The independent-samples t-Test compares the means of two independent groups, but in this case the groups are not independent. An independent-samples t-Test with change scores involves subtracting posttest scores from pretest scores to create a new variable, but this method can be less powerful and accurate than the paired-samples t-Test.

In a Pilot Study, Dana Wants to Test the Significance