Eight movie releases — A, B, C, D, E, F, G, and H — are evaluated by two film critics, Sofia and Lucas. Each critic ranks the films from 1 (best) to 8 (worst) based on their artistic merit.
| Rank | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|---|---|---|---|---|---|---|---|---|
| Sofia | E | A | G | B | H | D | F | C |
| Lucas | A | G | E | H | B | F | D | C |
Calculate Spearman’s rank correlation coefficient for this data.
Stating your hypotheses clearly, test at the 5% level of significance whether or not there is a positive correlation between the artistic rankings of the two critics.
157 exam-style questions on AQA A Level Maths 2.2.2 Scatter diagrams and correlation. Each one has a worked solution and a mark scheme showing where the marks go.