Regression toward the mean is the

A) tendency for unusual scores to fall back toward a distribution's average.
B) basis for all tests of statistical significance.
C) reason the range is a more accurate measure of variation than the standard deviation.
D) reason the standard deviation is a more accurate measure of variation than the range.

Regression Toward The Mean

The tendency for extreme or unusual scores or events to fall back (regress) toward the average.

Unusual Scores

Scores that significantly deviate from the norm or average in any type of assessment, indicating atypical performance or results.

Average

A statistical measure representing the central tendency or typical value of a set of numbers, calculated as the sum of the values divided by the number of values.