Hypothesis 4 concerned the mediating effect of ego depletion.
Using the Preacher and Hayes (2008) method, we calculated the
bias-corrected bootstrap 95% confidence interval of the indirect ef-
fect over 5000 iterations. The lower bound of the confidence inter-
val was .15, and the upper bound was .02. This indicates that
cognitive fatigue mediates the relationship between sleep and
unethical behavior, supporting Hypothesis 4.

这是什么意思，为什么迭代5000次？
为什么95%的置信区间范围改变