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Z score

A statistical score expressed in terms of its relative position in the frequency distribution of which it is a part. A score is converted to a z score so that it may be compared with scores from other tests or measuring instruments. A Z score is obtained by subtracting a raw score from the arithmetic mean of the distribution of scores and dividing by the standard deviation of the distribution. The Z score is often referred to as the standard score and occasionally as the sigma score.

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