NO.PZ2023061301000005
问题如下：
Compared with bootstrap resampling, jackknife resampling:
选项：
A.is done with replacement.
usually requires that the number of repetitions is equal to the sample size.
produces dissimilar results for every run because resamples are randomly
drawn.
解释：
B is correct. For a sample of size n, jackknife resampling usually requires n repetitions.
In contrast, with bootstrap resampling, we are left to determine how many
repetitions are appropriate.
题目：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:
为什么0.835代表下面的公式
这个又代表什么呢
