Wechsler Adult Intelligence Scale (WAIS) scores produce a mean of 100 and a standard deviation of 15. This suggests that 2/3 of all adults obtain a score between _______.

Question

Quizplus · Accepted Answer

A standard deviation of 15 means that 68% of the population falls within one standard deviation of the mean of 100, which gives a range of 85-115. Two standard deviations from the mean covers about 95% of the population, which gives a range of 70-130. Thus, the correct answer is B, which represents the middle range within one standard deviation of the mean.

Wechsler Adult Intelligence Scale (WAIS) Scores Produce a Mean of 100