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Alicess · 2020年07月04日

问一道题:NO.PZ2017092702000156 [ CFA I ]

问题如下:

Using the information in the following table, the sample standard deviation for VWIGX is closest to:

选项:

A.

6.02%

B.

12.04%.

C.

24.54%

解释:

C is correct. The sample variance is defined as sum of the squared deviations from the sample mean divided by the sample size minus one, and the sample standard deviation equals the square root of the sample variance.

The sample variance is thus equals to 6.02. The square root of the sample variance is the sample standard deviation and equals to 24.54%.

A is incorrect because it is the sample variance for VWGIX, not its sample standard deviation.
B is incorrect because it represents the sum of the squared deviations from the mean, not the sample standard deviation.


老师您好,u和x(头上一横打不出)都表示均值是吗
1 个答案

星星_品职助教 · 2020年07月04日

同学你好,

μ是总体均值,一般总体的值用希腊字母表示,例如总体标准差是σ

X bar是样本均值,一般样本的值用罗马字母表示,例如样本标准差s