Chapt.%205-1

Essentials of Statistics for the Behavioral Science

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    Chapter 5 z Scores:  Locating Scores in a Distribution
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    Introduction In addition to describing characteristics of distributions – we also like to  describe individual scores in the distribution.   The purpose is to compare scores in one distribution with a score in  another distribution.   This requires converting individual “raw” scores to standard or  uniform scores.  The “z” score is the most common transformation that we use in  statistics.
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    Definition of a z Score A z score is a standard score calculated from the mean and standard  deviation of a distribution. The z score tells us where an individual score is relative to the mean  of the distribution in terms of “Standard Deviation Units”. A positive z score means the raw score is above the mean and a  negative z score means the raw score is below the mean.
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    Calculating a z Score
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This document was uploaded on 02/18/2011.

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Chapt.%205-1 - Chapter5...

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