Question

e scores, and it is not a measure of statistical variability.
s from the average class score, and it is
measure of statistical variability.
is not

Explanation:

The problem is about determining if a certain measure (likely related to deviations from average class score) is a measure of statistical variability. Statistical variability measures like range, variance, standard deviation, etc., quantify how spread out data is. If the measure is about deviations from the mean (like deviation scores), it is a measure of variability. So the correct choice should be "is".

Answer:

is