The expression $\Sigma\left(X_{i}-\bar{X}\right)$
Instructs us to
A)sum the scores
B)sum the scores and then subtract the mean
C)subtract every "ith" score from the mean
D)subtract the mean from each score and add up the deviations

Question

Quizplus · Accepted Answer

The expression $\Sigma\left(X_{i}-\bar{X}\right)$ is used to calculate the sum of deviations from the mean. This means subtracting the mean from each score and adding up all the deviations. Therefore, the correct choice is D.

The Expression Σ(Xi−Xˉ)\Sigma\left(X_{i}-\bar{X}\right)Σ(Xi​−Xˉ) Instructs Us to A)sum the Scores B)sum the Scores and the Scores

The Expression $\Sigma\left(X_{i}-\bar{X}\right)$ Instructs Us to
A)sum the Scores
B)sum the Scores and the Scores