Work out bootstrap confidence interval instantly with clear inputs, formula shown and shareable results.
The bootstrap resamples the data with replacement to estimate the sampling distribution of a statistic. For the mean the resampling standard error converges to s·√((n−1)/n)/√n, which is what this reports analytically.
Bootstrap standard error of the mean
SE* = (s/√n)·√((n − 1)/n)
It needs no distributional assumption, so it works for medians, quantiles and other statistics with no simple formula.
A thousand suffices for standard errors, but percentile intervals in the tails usually want ten thousand or more.