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标题: [求助]还有27天！！一道sample exam中的统计概念题 [打印本页]

作者: michigan09 时间: 2008-11-10 03:51 标题: [求助]还有27天！！一道sample exam中的统计概念题

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？

作者: minminmin 时间: 2008-11-10 23:48

D？

作者: fightershi 时间: 2008-11-15 00:15

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？

作者: tweety0930 时间: 2008-11-16 23:03

D!

b可大可小可等

作者: fightershi 时间: 2008-11-17 23:52

D为什么错？没看出来

望高人解答

作者: kqr2009 时间: 2008-11-20 11:21

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

作者: ocelb 时间: 2008-11-20 23:53

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……

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