You are trying to find out your friend's IQ. She won't tell you. But she did say that her Z-score on a standard Wechsler test (M = 100; SD = 15) was + 2.0. What's her IQ?
A)100
B)200
C)115
D)130
E)85

Question

Quizplus · Accepted Answer

A Z-score of +2.0 on the Wechsler test, which has a mean (M) of 100 and a standard deviation (SD) of 15, means her score is 2 standard deviations above the mean. Calculating this gives: 100 + (2 * 15) = 130.

You Are Trying to Find Out Your Friend's IQ