Which of the following is the index of how much a typical score differs from the mean of a group of scores?
A) z-score
B) range
C) Pearson r
D) standard deviation

Question

Quizplus · Accepted Answer

The standard deviation is a measure of the spread of scores around the mean, indicating how much scores deviate from the mean on average. A higher standard deviation means that scores are more spread out from the mean, while a lower standard deviation means that scores are clustered closely around the mean.

Which of the Following Is the Index of How Much