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荣国丞 · 2023年07月10日

疑问这道题我怎么知道是一个总体还是两个总体呢

  1. CFA I
  2. Quantitative

NO.PZ2015120604000146

问题如下：

Here is a table discribing sample statistics from two bonds' rate of return which are both normally distributed over the past decades. If an investor is considering whether the variance of bond A is greater than 3.24%,

which of the following conclusion is least appropriate (significant level=5%) ?

选项：

A.

It is appropriate to use the F-test.

B.

The hypothesis is :H0: σ2≤3.24%.

C.

It is appropraite to use the chi-square test.

解释：

The chi-square test is used to test hypotheses concerning a single population variance.So C is correct.

The null hypothesis can place in whatever you want to reject, so B is correct.

题干问选择least appropriate,So choose A.

😯这道题我怎么知道是一个总体还是两个总体呢

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1 个答案

星星_品职助教 · 2023年07月10日

同学你好，

这道题问的是“...whether the variance of bond A is greater than 3.24%”。题干限定了检验的是bond A的方差，对应总体也是bond A自身的总体，不涉及到bond B。

大部分涉及到两个总体的问题都是在检验两个总体的均值是否相等。

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