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$$z$$ 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 $$z$$ score less than $$-3.00$$ or greater than $$+3.00$$.

Identifying Outliers Using z Scores

When using z scores to quantitatively define outliers within a distribution, a score is commonly considered an outlier if it is more than how many standard deviations away from the mean?

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