User talk:Steven A Brown
The z-score measures how many standard deviations a data value is ABOVE the mean. Saying "above or below the mean", or "differs from the mean" is incorrect.
Example: z = -5
<=> -5 standard deviations ABOVE the mean
<=> 5 standard deviations BELOW the mean
It is incorrect to say z=-5 means that a data point "differs from the mean by -5 standard deviations", or "is above or below the mean by -5 standard deviations".
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