A revision workbook covering Section D of the AQA GCSE Statistics specification (8382) — statistical measures, from averages and spread to Spearman’s rank correlation. Suitable for Foundation and Higher tier, with Higher-only content clearly signposted.
Topics covered:
Mode, median and arithmetic mean — selecting the most appropriate average with full justification
Estimating the mean from grouped data — midpoints, Σfx method, why it’s an estimate
Weighted mean and geometric mean, including when the geometric mean cannot be used
Skewness by inspection and by calculation (Higher — formula given)
Range, interquartile range, percentiles, interdecile range, interpercentile range
Standard deviation (Higher — formula given), with 2024 exam worked example
Identifying outliers — by inspection (Foundation) and using the 1.5×IQR rule (Higher)
4-point moving averages and n-point moving averages — calculating and plotting correctly
Lines of best fit: by eye, through the double mean point, extrapolation vs interpolation
Spearman’s rank correlation coefficient — full worked example with tied ranks, interpretation
Includes worked examples using authentic 2024 AQA exam questions, common mistake boxes based on examiner reports (including the 4–9% suitability mark rate at Foundation), exam-style practice, and a full mark scheme.
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