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z-Scores - Coggle Diagram
z-Scores
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Formula
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Numerator is the deviation score, which is measuring the distance from the mean
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A z-score of 1 means the score is 1 standard deviation above the mean, a z-score of −1 means it is 1 standard deviation below the mean.
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z-Scores help to determine whether a score is average, high, or low
Knowing only a raw score is not enough, you need the means and standard deviation to interpret it.
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In statistics, z-scores help evaluate how well a single score represents a population