?For the following data from a repeated-measures study,the sample mean difference is M_D = 4. $$\begin{array} { l r r } \text { Participant } & X _ { 1 } & X _ { 2 } \ \hline \text { A } & 1 & 7 \ \text { B } & 4 & 8 \ \text { C } & 5 & 3 \ \hline \end{array}$$

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Quizplus · Accepted Answer

The sample mean difference M_D is calculated as the average of the differences between X₂ and X₁ for each participant. The differences are 6, 4, and -2, respectively, leading to an average of (6 + 4 - 2) / 3 = 8 / 3 ≈ 2.67, not 4.

?For the Following Data from a Repeated-Measures Study,the Sample Mean