Paper 2 · Statistics
⏱ Tested in 5 exam questions since 2023
Lesson 5 of 21
Statistics 5 – Scatter Graphs, correlation coefficient, line of best fit
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- Draw a scatter graph from bivariate data, using broken axes where needed
- Draw the line of best fit through the average point (x̄, ȳ) — non-negotiable
- Find the slope of the line of best fit with m = (y₂−y₁)/(x₂−x₁)
- Find r on the calculator and interpret it in context (strong/moderate/weak, ±)
Most recent exam questions
- 2024 Paper 2 Q1(b) — qualitative description of paired data. Look for direction (everyone improved? everyone…
- 2024 Paper 2 Q1(c) — Pearson's correlation coefficient — typically computed on the calculator's two-variable…
- 2024 Paper 2 Q9(a)(i) — correlation coefficient — sign (positive/negative) reflects whether the variables increa…
- 2024 Paper 2 Q9(a)(ii) — line of best fit drawn by eye — should balance points above and below it, and have a slo…
- 2023 Paper 2 Q5(a)(ii) — correlation coefficient r — Pearson's measure of linear association between two variable…
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