The sum of the differences between sample observations and the sample mean is equal to _______.
A) Zero
B) The mean deviation
C) The range
D) The standard deviation

Question

Quizplus · Accepted Answer

This is the definition of the sample mean, which is the central point around which the observations tend to cluster. The sum of the deviations from this point must be zero, since some observations will be above and some below the mean.

The Sum of the Differences Between Sample Observations and the Sample