Dr Aris is conducting a study on the relationship between sleep and cognitive performance in young adults. He selected seven participants and measured their average nightly sleep duration (in hours) over a week, and then assessed their cognitive flexibility using a standardized assessment (scored from 1 to 100).
Complete the table and calculate Spearman’s rank correlation coefficient (rsr_srs) between sleep duration and cognitive flexibility.
| Sleep duration (hours) | Rank 1 | Cognitive flexibility score | Rank 2 | ddd | d2d^2d2 |
|---|---|---|---|---|---|
| 5.5 | 6.5 | 45 | 7.0 | ||
| 5.5 | 6.5 | 52 | 5.0 | ||
| 6.0 | 5.0 | 48 | 6.0 | ||
| 7.2 | 3.5 | 60 | 4.0 | ||
| 7.2 | 3.5 | 75 | 2.5 | ||
| 8.0 | 2.0 | 75 | 2.5 | ||
| 8.5 | 1.0 | 82 | 1.0 | ||
| 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.