猫咚 · 2019年11月05日
问题如下：
The table below shows part of the monthly stock returns of Ivy Corp.
Calculate the sample standard deviation for Ivy Corp. returns, assuming above tabe inclues all samples??
选项：
A.8.78%.
B.8.01%.
C.77.1%2.
解释：
A is correct
Sample standard devation is 8.78%, the square root of sample variance 77.1%2
你好，题目说包含了所有样本，不就是总体吗？
NO.PZ2015120604000052 问题如下 The table below shows part of the monthly storeturns of Ivy Corp.Calculate the sample stanrviation for Ivy Corp. returns, assuming above tainclus all samples?? A.8.78%. B.8.01%. C.77.1%2. A is correctSample stanrvation is 8.78%, the square root of sample varian77.1%2 老师，我计算器输入之后，SX是0.087788，与一致，但是 方差是0.080139，X拔是0.076667也是对的，为啥方差不是C，标准差的平方呢？
NO.PZ2015120604000052 问题如下 The table below shows part of the monthly storeturns of Ivy Corp.Calculate the sample stanrviation for Ivy Corp. returns, assuming above tainclus all samples?? A.8.78%. B.8.01%. C.77.1%2. A is correctSample stanrvation is 8.78%, the square root of sample varian77.1%2 如题，或者用什么方法求的方差77.1%？
没明白，能给一下详细吗？
答案中square root 不是平方根的意思吗？错了吧！
