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GCSE Statistics · key term
A calculated limit used to identify outliers: values below the lower limit or above the upper limit are classified as outliers.
Used by Edexcel
Specification 2c.02, 2c.03 · Paper 1, Paper 2
A calculated limit used to identify unusually small or large values. Values beyond the limit are classified as outliers under the chosen rule.
An outlier boundary identifies an unusual value; it does not prove that the value is an error.
Use strict inequalities: a value exactly on an outlier boundary is not outside it.
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