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过儿 · 2021年09月08日

定量

domains of their pdfs 这个词是什么意思

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

您的回答, 正确答案是: C

A

They are both asymmetric distributions.

B

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

C

正确The domains of their pdfs are positive and negative numbers.

数据统计(全部)

做对次数: 15

做错次数: 7

正确率: 68.18%

数据统计(个人)

做对次数: 1

做错次数: 0

正确率: 100.00%

解析

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

1 个答案

星星_品职助教 · 2021年09月09日

同学你好,

domain是定义域的意思。pdf对应的是累积概率函数,即根据cdf(概率密度函数,即分布的那条曲线)进行概率累积的函数。

由于 chi-square and F-distributions的所有图像都在第一象限(... are bounded from below by zero),所以这两个分布无论是cdf还是pdf都只定义在全是正数的第一象限部分。

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