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Nan🌞 · 2021年11月08日

A为什么是对的?

NO.PZ2021062201000010

问题如下:

Which one of the following statements concerning chi-square and F-distributions is false?

选项:

A.

They are both asymmetric distributions.

B.

As their degrees of freedom increase, the shapes of their pdfs become more bell curve-like.

C.

The domains of their pdfs are positive and negative numbers.

解释:

C is correct, since it is false. Both chi-square and F-distributions are bounded from below by zero, so the domains of their pdfs are restricted to positive numbers

这两个分布不都是不对称的吗

1 个答案

星星_品职助教 · 2021年11月08日

同学你好,

 chi-square and F-distribution都是不对称的,所以A选项的本身描述是正确的。本题要选“false”的一项,所以不能选。