Under the normal curve, 68% of the cases must always fall
A) above the mean
B) between + 1 standard deviation units from the mean
C) between + 2 standard deviation units from the mean
D) all of these, depending on the particular shape of the curve

Question

Quizplus · Accepted Answer

The empirical rule, also known as the 68-95-99.7 rule, states that approximately 68% of the cases fall within one standard deviation of the mean, which corresponds to choice B. This is true regardless of the shape of the curve.

Under the Normal Curve, 68% of the Cases Must Always