Someone please help me out with this. I am terrible at statistics. Could someone please show me how to compare scores from the NBME and the USMLE. Example: Johnny gets a 570 on the NBME self assessment. He is relieved to find out that he has scored above the mean, but when he asks himself what his score would equate to on the real thing he becomes irritated and confused. The mean on the self assessment is 500 with a standard deviation of 100. If the mean of USMLE step1 is 216 with a standard deviation of 24, what score on step1 is equivalent to a 570 on the NBME? I've heard z-scores are involved so I figured I'd consult the experts... For full credit you must show your work.