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iamjj · 2022年12月06日

老师请解释一下b选项的说法

  1. CFA I
  2. Quantitative

NO.PZ2015120604000147

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 mean of bond B is greater than 26%,

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

选项：

A.

It is approptiate to use the Z-test.

B.

The mean of bond B is not significant greater than 26%.

C.

It is a one-tailed test.

解释：

B is correct.

It is appropraite to ues the one-tailed Z-test because the sample size of bond B is bigger than 30.

The null hypothesis is: H0: μ ≤ 26%

The test statistic:


α= 5% indicates the critical value is equal to ±1.65.

Because 1.91>1.65, therefore, we should reject the null hypothesis.

咱们学的都是significant different from H0,这个b选项说greater什么的，这个怎么判断啊

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1 个答案

星星_品职助教 · 2022年12月07日

同学你好，

如果原假设为μ等于一个具体的数，例如H0：μ=26%。此时拒绝原假设才是μ≠26%，即μ is significant different from 26%。

本题的原假设为μ≤26%。所以拒绝原假设就相当于μ＞26%，此时正确的描述应为μ is significant greater than 26%。

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