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木水日 · 2019年04月22日

问一道题：NO.PZ2015121802000021 [ CFA I ]

  1. CFA I
  2. Portfolio

问题如下图：

选项：

A.

B.

C.

解释：

我用计算器算的。S是本题答案，不明白为啥不是用总体的？之前数量那章里这种计算几个数的标准差确定不都是总体的标准差么？

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Wendy_品职助教 · 2019年04月23日

同学你好，要习惯CFA题目的这种方式，题干有时候不会明说，但是我们可以推导出来，这道题就是这样，这是个样本，选取了一个资产五年的回报率，其实真实的投资市场中研究的可能都是样本，总体可能并不知道。数量那章节可能是为了让大家掌握知识点理想化。还是要注意题干，多做题其实就会慢慢习惯CFA的这种出题方式了。

木水日 · 2019年04月23日

好的，谢谢！不过我还是没有透彻的懂，晚点我再提交一个新问题来问吧

Wendy_品职助教 · 2019年04月24日

好的，同学，你可以把你还不清楚的点说出来，我们一起解决。

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