Thursday, April 30, 2015

In a problem involving data that is normally distributed, the Z-score is how many standard deviations from the mean that a sample data value lies. For example, if the standard deviation is 10 and the mean is 20, then a data value of 25 is 5 units from the mean and 5/10, which is 1/2 standard deviation away from the mean. The Z-score is then 0.5.

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