Dr Aris carried out a correlational study to investigate whether there was a relationship between weekly hours of moderate exercise and subjective sleep quality score (on a scale of 1 to 20).
The results from Dr Aris's investigation are shown in Table 1.
Complete Table 1 and calculate the Spearman's rank correlation coefficient for Dr Aris's investigation.
Table 1: Weekly exercise hours and sleep quality scores
| Weekly exercise (hours) | Rank 1 | Sleep quality score | Rank 2 | ddd | d2d^2d2 |
|---|---|---|---|---|---|
| 3.0 | 3.5 | 12 | 3 | ||
| 1.5 | 2 | 8 | 1 | ||
| 3.0 | 3.5 | 15 | 5 | ||
| 5.0 | 6 | 17 | 6 | ||
| 0.5 | 1 | 10 | 2 | ||
| 6.0 | 7 | 19 | 7 | ||
| 4.0 | 5 | 14 | 4 | ||
| Total: | ∑d2=\sum d^2 =∑d2= |
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.