The t test for correlated groups is just like the t test for single samples except that it analyzes difference scores.

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Quizplus · Accepted Answer

The t test for correlated groups, also known as the paired samples t-test or dependent samples t-test, is used to compare the means of two related or paired groups. It analyzes the difference scores between the paired observations of the same individuals or entities, rather than testing the mean of a single sample against a known or hypothesized value. Therefore, the statement is true.

The T Test for Correlated Groups Is Just Like the T