Z-Scores

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A form of standardised score on a test which is obtained by expressing the raw score (actual score) in terms of the relationship of that score to the mean or average score.

The difference is expressed in units of the standard deviation. For example, a raw score that was above the mean score by one standard deviation would have a z-score of +1; a raw score below average would have a minus z-score.

SECTION THREE
Historical Background

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Z-Scores from Dictionary of British Education. ISBN: 0-203-48545-9. Published: 2005–01–05. ©2009 Taylor and Francis. All rights reserved.