问一道题：NO.PZ2015120604000148

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 equal to the variance of bond B,

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

选项：

It is appropriate to use the $χ^{2}$ -test.

It is appropriate to use the F-test.

The null hypothesis is: $H_{0} : σ_{1}^{2} = σ_{2}^{2}$

解释：

A is correct.

The F-test is appropriate to the equality of two independent normally distributed population variances. $χ^{2}$ -test is appropriate to test whether a vatiance from a normally distributed population is equal to a certain value.

老师怎么看出和两个 independent的

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1 个答案

星星_品职助教 · 2020年02月22日

同学你好，

这道题不用看太细节，考察的是卡方检验用于检验方差是否等于一个固定的数，所以“最不正确”的肯定是要选卡方检验。

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问一道题：NO.PZ2015120604000148

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