Dr. Aris is conducting research into the relationship between sleep and cognitive performance. He asked seven students to record the number of hours of sleep they got the night before an exam, and then sit a cognitive focus test scored out of 50.
Complete the table and calculate Spearman’s rank correlation coefficient (rsr_srs) between hours of sleep and cognitive focus test score. Show your working and give your final answer to two decimal places.
| Hours of sleep | Rank 1 | Focus test score | Rank 2 | ddd | d2d^2d2 |
|---|---|---|---|---|---|
| 5 | 6.5 | 25 | 6 | ||
| 5 | 6.5 | 20 | 7 | ||
| 6 | 5 | 35 | 4 | ||
| 7 | 4 | 30 | 5 | ||
| 8 | 3 | 45 | 2 | ||
| 9 | 1.5 | 40 | 3 | ||
| 9 | 1.5 | 48 | 1 | ||
| 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.