请问什么时候除以根号下n-1.总记得哪里有标准差除以根号下n-1.

NO.PZ2015120604000178

问题如下：

BIM is a well-developed public company and its market capitalization growth rates over past few decades are normally distributed.The population has a mean of 10% and a standard deviation of 5.4%. An investor wants to figure out the probability that BIM's average capitalization growth rate will over 12.32% in the next three years (all the data are monthly statistics).Which of the following option is most accurate?

选项：

0.5%.

1%.

5%.

解释：

A is correct.

It is appropriate to use the central limit theroy to calculate. Standard error=5.4%/ $\sqrt {\rm{36}}$ P(X＞12.32%)=P(Z＞ (12.32%-10%)/0.009)=P(Z＞2.58). So the corresponding probability is 0.5%.

既然是样本，为什么不能是除以n-1. 很多概念很容易记混淆了。

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星星_品职助教 · 2022年04月07日

同学你好，

给出一系列数字，计算样本标准差时，公式分母为n-1，如下：

当总体标准差或样本标准差已经给出，同时题干中给出了sample size。根据中心极限定理，计算标准误的公式分母为n，如下：

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请问什么时候除以根号下n-1.总记得哪里有标准差除以根号下n-1.

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