The sum of the deviations about the mean must equal.
A)zero
B)1.0
C)-1.0 or +1.0
D)a value that varies with the number of scores

Question

Quizplus · Accepted Answer

The sum of the deviations about the mean must always equal zero by definition. This is because the mean is calculated by summing all the scores and dividing by the number of scores, so any deviation above the mean must be cancelled out by a deviation below the mean in order for the sum to equal zero.

The Sum of the Deviations About the Mean Must Equal