Using the same data,a related-samples t test has greater power than a two-independent-sample t test to detect an effect.

Question

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A related-samples t test (paired t test) has greater power than a two-independent-sample t test because it uses the same participants for both groups, thus reducing individual differences and increasing the sensitivity of the test to detect an effect. In contrast, a two-independent-sample t test has to deal with individual differences among participants, which can reduce the power of the test to detect differences between groups.

Using the Same Data,a Related-Samples T Test Has Greater Power