A sample of n = 20 scores is transformed into z-scores.What is the mean for the set of 20 z-scores?
A)0
B)1
C)10
D)Cannot be determined without more information

Question

Quizplus · Accepted Answer

The mean of any set of z-scores is always 0. This is because the calculation of a z-score involves subtracting the population mean and dividing by the population standard deviation, which results in a distribution with a mean of 0 and a standard deviation of 1. Therefore, regardless of the original scores, the mean of the z-scores will always be 0.

A Sample of N = 20 Scores Is Transformed into Z-Scores.What