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Ivana 🍭 · 2022年09月08日

请问A为什么不对？

  1. CFA I
  2. Quantitative

NO.PZ2015120604000150

问题如下：

Evelyn Smith is studying about the relationship of the χ2-distribution and the F-distribution. Which of the following conclusion is most appropriate?

选项：

A.

Both of their variances are smaller than their means.

B.

Both of them are symmetrical.

C.

Both of them can not be negative.

解释：

C is correct.

The F-distribution and the χ2-distribution are positive and they are asymmetical. There is no solid relationship between the means and variances of this two distributions.

老师，请问A为什么不对？

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1 个答案

星星_品职助教 · 2022年09月09日

同学你好，

卡方分布以及F分布中，均值和方差大小没有确定性的关系。可能根本不可比（单位不同），也可能可比但不一定谁大谁小。

即答案解析中描述的“There is no solid relationship between the means and variances of this two distributions”

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