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Dang.D · 2021年08月26日

这个是考点吗请问

  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.

如下图所示，这是一个POOLED ESTIMATOR。

之所以为POOLED，可以理解为在等式右边需要同时用到S1以及S2两个不同样本的方差。而上图的公式，是T检验中一步，这个T检验就是检验B选项说论述的假设检验。


请问这样的知识点是不是算比较偏的，是不是考点呀


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星星_品职助教 · 2021年08月27日

同学你好，

是比较偏的，但不能说绝对不考。所以建议按照以下的顺序复习：

重点知识点可能会固定考察1-3题；小知识点大概率根本不考，或者整个reading只出1道题（例如portfolio科目中的技术分析章节）。

所以复习的顺序是先掌握重点知识点（例如关于均值的t检验），然后再来掌握小知识（例如这道题目的pooled estimator）。时间分配应该达到二八法则，即80%的时间放在重点上。

类似本题的知识点，做个标记提示自己考前1-2天过一下有印象就可以了。

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