Sampling & Data Collection | OCR GCSE Higher Maths | 40 Worked Examples (J560)

40 fully worked OCR GCSE (9-1) Higher Mathematics questions on Sampling and Data Collection (J560, strand OCR 12 Statistics, spec 12.01). Every solution is broken down line by line with plain-English reasoning and OCR mark-scheme annotations (M/A/B marks). Progressive Easy to Challenging structure covers: population vs sample, census, why we sample, simple random sampling with random numbers, identifying and reducing bias, self-selection and non-response, inferring and estimating population totals from a sample, primary vs secondary data, categorical/numerical and discrete/continuous data, and critiquing survey questions and data-collection methods. Scoped strictly to the OCR J560 specification (no stratified sampling or capture-recapture, which OCR does not examine). Ideal for revision, homework and exam practice.