About ________ percent of WAIS scores fall between 70 and 130.
A) 30
B) 60
C) 70
D) 95

Question

Quizplus · Accepted Answer

The WAIS is a standardized test with an average score of 100 and a standard deviation of 15. Therefore, 68% of scores fall within one standard deviation above or below the mean, which in this case would be between 85 and 115. However, we know from research that the distribution of scores on the WAIS is roughly normal, which means that if we look at two standard deviations above and below the mean, we should capture approximately 95% of all scores. This means that roughly 95% of all WAIS scores fall between 70 and 130.

About ________ Percent of WAIS Scores Fall Between 70 and 130