The tail portion of a normal curve is the area of the curve between
A) 2 and 3 standard deviations above the mean.
B) -2 and -3 standard deviations below the mean.
C) Both 2 and 3 standard deviations above the mean and -2 and -3 standard deviations below the mean.
D) None of these

Question

Quizplus · Accepted Answer

The tail portion of a normal curve includes both the area beyond 2 and 3 standard deviations above the mean (the upper tail) and the area beyond 2 and 3 standard deviations below the mean (the lower tail). Therefore, option C is the correct choice.

The Tail Portion of a Normal Curve Is the Area