NO.PZ2021062201000014
问题如下：
Otema Chi has a spreadsheet with 108 monthly returns for shares in Marunou Corporation. He writes a software program that uses bootstrap resampling to create 200 resamples of this Marunou data by sampling with replacement. Each resample has 108 data points. Chi's program calculates the mean of each of the 200 resamples, and then it calculates that the mean of these 200 resample means is 0.0261. The program subtracts 0.0261 from each of the 200 resample means, squares each of these 200 differences, and adds the squared differences together. The result is 0.835. The program then calculates an estimate of the standard error of the sample mean.
The estimated standard error of the sample mean is closest to:
选项：
A. 0.0115
B. 0.0648
C. 0.0883
解释：
B is correct.
The estimate of the standard error of the sample mean with bootstrap resampling is calculated as follows:
使用 bootstrap resampling对样本均值的标准误的估算如下：
我理解样本标准差s的计算按照定义应该是0.835除以199，然后开根号，得到s=0.0648 而题目问的是标准误，应该用s再除以根号下108 请老师详细解释下这道题，谢谢！
