For a set of scores the sum of the deviation scores will be zero
A) when half the scores are negative
B) when the mean is zero
C) only when the standard deviation is zero
D) always.

Question

Quizplus · Accepted Answer

The sum of the deviation scores from the mean is always zero because deviations are calculated as the difference between each score and the mean, and the positive and negative deviations balance each other out.

For a Set of Scores the Sum of the Deviation