The t test for two related measures
A) is complicated by the fact that we have two different sets of numbers.
B) is simplified by the fact that we really only focus on the column of difference scores.
C) is not a valid test if the pre- and post-measures are correlated.
D) is impractical because you do not know the population variance.

Question

Quizplus · Accepted Answer

The t test for two related measures is simplified by the fact that we really only focus on the column of difference scores. We take the difference between the pre- and post-measures for each participant, and use that column of differences to calculate the t statistic. The fact that we only have one column of numbers to work with makes the test simpler to compute than many other types of statistical analyses.

The T Test for Two Related Measures