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如此_AnnieCcc · 2021年02月06日

太偏了。。。

  1. CFA I
  2. Quantitative

NO.PZ2017092702000141

问题如下：

A pooled estimator is used when testing a hypothesis concerning the:

选项：

A.

equality of the variances of two normally distributed populations.

B.

difference between the means of two at least approximately normally distributed populations with unknown but assumed equal variances.

C.

difference between the means of two at least approximately normally distributed populations with unknown and assumed unequal variances.

解释：

B is correct.

The assumption that the variances are equal allows for the combining of both samples to obtain a pooled estimate of the common variance.

完全读不懂。。。

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1 个答案

星星_品职助教 · 2021年02月07日

同学你好，

这道题是比较偏僻的一个知识点，非常不重要，考到的几率非常小。

polled estimator是底下的那个公式。公式不用掌握。


对应的是讲义上第三行。

这页讲义里比较重要的是每一种情况对应的是什么检验。这个知识点整体都是“indentify”（识别）的要求。

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