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胡馨梦 · 2021年03月24日

什么表 怎么查

  1. CFA I
  2. Quantitative

NO.PZ2015120604000137

问题如下：

Ida Lee and his team collect a lot of analysis of statistical data about the car market .According to the data, they come to the conclusion that the mean price of SUV is more than $46,435 in his country. Then they randomly select 64 SUVs whose mean price is $46,760. Assuming the standard deviation of the sample is 1370. Ida Lee conducts a hypothesis test to check their conclusion. At which significant level should Ida Lee reject the null hypothesis?

选项：

A.

0.5%.

B.

5%.

C.

1%.

解释：

B is correct.

If the significant level is 5%, the critical value=1.669<1.8978, Ida Lee should reject the null.

If the significant level is 0.5%, the critical value=2.656>1.8978, Ida Lee will fail to reject the null.

If the significant level is 1%, the critical value=2.387>1.8978, Ida Lee will fail to reject the null.


老师 1.89算好了 查什么表 怎么看 不会 可以看一下表么 
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1 个答案

星星_品职助教 · 2021年03月25日

同学你好，

这道题总体方差未知，所以应该查t表，可从原版书附录中找到t表或者在学员“资料下载”处得到。

以正确的B选项为例。

由于这道题是单尾检验（备择假设为μ＞46435），所以当significant value等于5%时，就是单侧（右侧）尾部面积为5%所对应的关键值。

t检验的自由度为n-1即64-1=63.

根据以上信息，查t表结果如下：

（由于原版书t表没有63这个值，取最近的df=60判断即可）

可以仿照以上步骤自己练习查下A，C选项，有问题可以继续提问。

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