I've got the summary of a data set, but not the actual data. They've calculated confidence intervals using bootstrapping. I know the sample size, so if they were normally calculated confidence intervals, I'd know how to calculate standard deviation, but is there any relationship between the size of confidence intervals calculated from bootstrapping and sd?
Also, can it be said that doubling sample size sees the width of confidence interval reduce 25%/ when they have been calculated with bootstrapping?