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GCSE Mathematics · key term
The extent to which data values are close together. A smaller measure of spread indicates greater consistency.
Used by Edexcel
Specification S4 · Paper 1, Paper 2, Paper 3
Revise: Measures of Spread and OutliersA smaller range or IQR indicates less variation and therefore greater consistency. In the basketball data, Ben's IQR is 8 points and his range is 11 points. Sam's IQR is 12 points and his range is 20 points.
When comparing consistency, name the measure and quote both values: “Ben is more consistent because his IQR is 8 points, compared with Sam's 12 points.”
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