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syzsg004 · 2022年10月26日

不是应该想要推翻的放原假设么

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:

A.

It is appropriate to use the χ2 test.

B.

It is appropriate to use the F-test.

C.The null hypothesis is:H0 : σ1 2 =σ2 2

解释:

A is correct.

The F-test is appropriate to the equality of two independent normally distributed population variances.χ2 test is appropriate to test whether a variance from a normally distributed population is equal to a certain value.

根据题干内容C是对的么

1 个答案

星星_品职助教 · 2022年10月27日

同学你好,

当检验“=”和“≠”时,原则永远是将等号放在原假设。

只有检验大于或小于关系时,才需要考虑“想要推翻的放原假设”