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hyron · 2022年09月22日

1.这种需要查表的题目在考试中会有吗？2.本题为何不用Z分布检验？

  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.


1.这种需要查表的题目在考试中会有吗？2.本题为何不用Z分布检验



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星星_品职助教 · 2022年09月23日

@hyron

直接给一大张表的情况很少，实际中一般两种方式：

1）题干里给出一堆关键值和对应的自由度（如有），由考生自行选择出应该使用的那个关键值；

2）只给出表的一部分，一般只有几行几列，同样由考生在其中自行选择需要的数据。

无论哪种情况，都是基于查表的方式进行选择，所以核心还是要掌握查表的方法。

如果是正态分布，很多情况下直接用要求背诵的那几组关键值解题就够了，可以不用再去费时间查表。

星星_品职助教 · 2022年09月23日

同学你好，

1）考试需要掌握查表；

2）总体方差未知，需要优先使用的是t检验。

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