With the t test for correlated groups, the difference between the sample means always equals the mean of the difference scores.

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Quizplus · Accepted Answer

This is true. The t test for correlated groups calculates the difference between the scores of each pair of related samples, and then takes the mean of those difference scores. This mean of the difference scores represents the average amount of change between the two conditions or time points being compared. The t test then compares this mean difference score to the standard error of that mean difference to determine the statistical significance of the difference between the two conditions.

With the T Test for Correlated Groups, the Difference Between