Scatter Graphs and Correlation | OCR GCSE Maths Higher | 40 Worked Examples (J560)

Scatter graphs and correlation for OCR GCSE (9-1) Mathematics Higher tier (J560). 40 exam-style questions with fully worked, mark-scheme-annotated solutions: recognising positive, negative and no correlation, plotting extra points on a scatter diagram, describing correlation type and strength, drawing a line of best fit by eye, interpolation and extrapolation with their reliability, identifying and circling outliers, the effect of an outlier on the line of best fit and on the mean, reading predictions both ways off the line, the mean point as the pivot the line must pass through, rate of change from the line, and the correlation-versus-causation reasoning OCR examines heavily (confounding variables, spurious shared-time-trend correlations, and how to design a test for cause). Progressive Easy to Challenging difficulty, including a full multi-part exam-style question. Every working line is annotated, with OCR M/A/B marks folded in on the real mark-scheme lines. Built for OCR’s no-formula-sheet exam, and scoped to GCSE: correlation is described in words and the line is drawn by eye, with no correlation coefficient or regression (those are A-Level). Contains TikZ scatter diagrams throughout. Calibrated against OCR J560 past papers and mark schemes, not ported from another board (no function notation, no P-mark). Ideal for revision, homework, and 1-1 tuition.