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汪二喵 · 2022年10月22日

请问此题怎样判断是整体？

  1. CFA I
  2. Quantitative

NO.PZ2015120604000050

问题如下：

The table below shows the monthly stock returns of Ivy Corp.

According to the above table , calculate the population standard deviation for Ivy Corp. returns, assuming the population has 6 observations?

选项：

A.

8.78%.

B.

8.01%.

C.

48.06%.

解释：

B is correct

σ = σ 2 = p o p u l a t i o n v a r i a n c e

Population variance is 64.2 as calculated in previous question, thus population standard deviation is 8.01, the square root of 64.2.

问的是假如总体有六个observation，是不是说明这六个值不是整体，只是一个样本？

还有虽然我知道总体和样本的方差计算，但是这二者有什么联系和应用呢？如果我有一个样本，用样本的公式计算，再用得出的数值去估衡量整体吗？是否可以讲一下计算样本统计量的意义

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已采纳答案

星星_品职助教 · 2022年10月22日

同学你好，

1）计算总体标准差，说明是将这六个观察值就当做总体；如果题干要求计算的是样本标准差，则说明此时将这六个观察值当做样本。

2）总体在实际应用中经常是不知道的，此时只能做抽样估计，用样本的标准差去估计总体的标准差。

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