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: |
Practise Edexcel A Level Psychology Methods with exam-style questions for A Level Psychology. 638 questions, matched to the Edexcel A Level Psychology (9PS0) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.