standard error of the mean | inferential statistics | probability and statistics | khan academy Published 14 years ago • 1.1M plays • Length 15:15 Download video MP4 Download video MP3 Similar videos 1:08:04 ncea level 2 probability 2020 nzqa exam - worked answers 2:52 standard deviation vs standard error, clearly explained!!! 8:20 probability : solved examples : medium difficulty 3 examples