Assuming a normal distribution, where would you find approximately two thirds of the scores if they ranged from 30 to 68, M = 45, and SD = 7 Between:
A) 30 and 68
B) 31 and 59
C) 37 and 61
D) 38 and 52

Question

Quizplus · Accepted Answer

In the normal curve, 68% of scores will be within one standard deviation above or below the mean. In the example, two thirds of scores (66%) fall between 30 and 68. The mean = 45 and the SD = 7 for this sample. It follows that scores will fall between one standard deviation below (45 - 7 = 38) and one standard deviation above the mean (45 + 7 = 52).

Assuming a Normal Distribution, Where Would You Find Approximately Two