$$\text { The sample mean difference } \bar { d } \text { is equal to the difference of the sample means } \bar { x } _ { 1 } - \bar { x } _ { 2 } \text {. }$$

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Quizplus · Accepted Answer

The sample mean difference, denoted as $\bar{d}$, is calculated by subtracting the mean of one sample ($\bar{x}_2$) from the mean of another sample ($\bar{x}_1$), which is mathematically represented as $\bar{x}_1 - \bar{x}_2$. This calculation is used to compare the averages of two samples directly.