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How does the empirical rule help determine outliers?
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An outlier is an unusually small or unusually large value in a data set.

A data value with a z-score less than $-3$ or greater than $+3$ might be considered an outlier.

It might be:
- an incorrectly recorded data value
- a data value that was incorrectly included in the data set
- a correctly recorded data value that belongs in the data set
by Platinum (129,882 points)

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