The most commonly used statistical index of variability in a group of scores is the
A) range
B) variance
C) standard deviation
D) none of the above

Question

Quizplus · Accepted Answer

The standard deviation is the most commonly used statistical index of variability because it provides a measure of the average distance of each score from the mean, making it highly useful for comparing the spread of scores across different data sets.

The Most Commonly Used Statistical Index of Variability in a Group