View Full Version : Z score
01-25-2006, 12:18 PM
I am having difficulty understanding the Z score. Its looks like that SD and Z score is doing the same function? Could you please explain with small example?
01-25-2006, 12:29 PM
The z score tells you how many standard deviations away from the mean a particular value is.
For examle, if you have a data set with mean = 20 and std dev = 4, then 24 would be:
z = (x-mu)/s
z = (24-20)/4 = 1.0 standard deviation above the mean
01-25-2006, 04:41 PM
thank you John, You are really great in answering so quikly.
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