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Identifying Outliers Using z Scores

zz scores provide a quantitative method for defining outliers within a distribution. Commonly, an outlier is defined as any score that is more than three standard deviations away from the mean, which corresponds to a zz score less than 3.00-3.00 or greater than +3.00+3.00.

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Updated 2026-05-03

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Research Methods in Psychology - 4th American Edition @ KPU