[求助]还有27天！！一道sample exam中的统计概念题 face, 统计, measures, provides, normal

michigan09

16. 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

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

D. variance of a sample with 50 observations is computed by dividing the sum of the squared deviations from the mean by 49

答案没有找到，请问大家该选什么呢？

ocelb

 不是c么

d应该是正确的把

说的是variance又不是standard variance

arithmetic average of the deviations around the mean will always be equal to one

中的one应该改成zero吧……

kqr2009

D应该是variance divided by the squart root of 49. S/sqrt(N-1).

fightershi

D为什么错？没看出来

望高人解答

tweety0930

D!

b可大可小可等

fightershi

好题啊。

我在想，B中只说明了小于的情况，没说等于的情况，算不算错呢？

minminmin

D？