Dr. Alistair's investigation on weekly reading hours and vocabulary performance among 10 secondary school students yielded the data shown in Table 1.
Complete Table 2 and calculate Spearman’s rank correlation coefficient (rsr_srs) between the number of hours spent reading per week and the vocabulary score.
| Student | Number of hours reading per week | Vocabulary score |
|---|---|---|
| A | 2 | 10 |
| B | 3 | 12 |
| C | 8 | 12 |
| D | 6 | 15 |
| E | 9 | 18 |
| F | 12 | 18 |
| G | 13 | 25 |
| H | 15 | 25 |
| I | 5 | 15 |
| J | 10 | 17 |
| Number of hours reading per week | Rank 1 | Vocabulary score | Rank 2 | ddd | d2d^2d2 |
|---|---|---|---|---|---|
| 2 | 1 | 10 | 1 | ||
| 3 | 2 | 12 | 2.5 | ||
| 8 | 5 | 12 | 2.5 | ||
| 6 | 4 | 15 | 4.5 | ||
| 9 | 6 | 18 | 7.5 | ||
| 12 | 8 | 18 | 7.5 | ||
| 13 | 9 | 25 | 9.5 | ||
| 15 | 10 | 25 | 9.5 | ||
| 5 | 3 | 15 | 4.5 | ||
| 10 | 7 | 17 | 6 | ||
| Total: |
638 exam-style questions on Edexcel A Level Psychology Methods. Each one has a worked solution and a mark scheme showing where the marks go.