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Understanding z scores

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Understanding z scores. Standard scores. Standard scores assume a normal distribution They provide a method of expressing any score in a distribution in terms of its distance from the mean in standard deviation units. Z-score. A raw score by itself is rather meaningless. - PowerPoint PPT Presentation

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Understanding z scores

Understanding z scores

Standard scoresStandard scores assume a normal distributionThey provide a method of expressing any score in a distribution in terms of its distance from the mean in standard deviation units2

Z-scoreA raw score by itself is rather meaningless.What gives the score meaning is its deviation from the meanA Z score expresses this value in standard deviation units3

Z-score

4Raw score

Mean

Standard deviation

Z score formula

5

Z score computation

6


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