Original pairs of scores are first reduced to difference scores before computing the test statistic for the related-samples t test.

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Quizplus · Accepted Answer

This statement is true. The related-samples t test involves comparing the means of two sets of scores that are related (e.g. pre- and post-treatment scores, scores from a matched-pairs design). To do so, the paired scores are first reduced to difference scores (the post-treatment score minus the pre-treatment score, for example), and then the mean difference score is compared to an expected population mean difference using a t test.

Original Pairs of Scores Are First Reduced to Difference Scores