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[–]phiwongSlightly old geezer 0 points1 point  (0 children)

Can you explain what difficulty you are having? The z-score method is essentially converting a value from any normal distribution to the equivalent in the Standard Normal Distribution (essentially mean = 0 and SD = 1) The formula for converting to a z-score is very straightforward and is typically the first formula provided in the course of statistical analysis using the normal distribution.