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GCSE Statistics · key term
The difference between two specified percentile values, measuring the spread of that part of the ordered data.
Used by Edexcel
Specification 2c.01, 2c.04, 2c.05 · Paper 1, Paper 2
The higher of two specified percentile values minus the lower percentile value.
Revise: Calculating measures of spreadAn interpercentile range is the difference between two specified percentile values.
Compare the same measure for both data sets, using the same units. For an interpercentile range, use the same percentile boundaries.
For these comparisons, pair the median with IQR, interpercentile range or interdecile range; pair the mean with standard deviation. Do not pair mean with IQR or median with standard deviation.
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The difference between two specified percentiles. For example, measures the spread of the middle 80% of values.