为什么C是错误的呢

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：

It is approptiate to use the Z-test.

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

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: $H_{0} : μ$ ≤ $26%$

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.

如题

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星星_品职助教 · 2022年11月06日

同学你好，

检验的单双尾判断取决于备择假设。

根据题干中的“If an investor is considering whether the mean of bond B is greater than 26%”，可知本题的备择假设为Ha：μ＞26%。

所以这是一个单尾检验，拒绝域在右侧。C选项的描述本身是正确的，但因为本题要选择的是“least appropriate”，所以不能选。

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此后提问需要具体描述一下自己的问题和自己的解题思路。

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为什么C是错误的呢

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