单选题

The least accurate statement about measures of dispersion for a distribution is that the（）。

A、 range provides no information about the shape of the data distribution.
B、 mean absolute deviation will always be smaller than the standard deviation.
C、 arithmetic average of the deviations around the mean will always be equal to one.

【正确答案】 C

【答案解析】

Define, calculate, and interpret I) a range and mean absolute deviation, and 2) a sample and a population variance and standard deviation. The arithmetic sum of the deviations around the mean will always equal zero.