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Hugo(Xie Lanzhi) · 2020年01月01日

问一道题：NO.PZ2015120604000137

  1. CFA I
  2. Quantitative

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.


test-statistic=(46470-46435)/1370/8=0.2044

这样算对吗？为什么答案里没有这个数？不是和这个数比较吗？

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1 个答案

星星_品职助教 · 2020年01月01日

同学你好，

这道题和你问的另一道题一样，计算式应该是(46760-46435)/(1370/8)=1.8978，第一项不是“46470”哈

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