An investigation was conducted to explore the relationship between daily caffeine consumption (mg) and the duration of deep sleep (minutes). The researcher collected data from a sample of 10 participants (N=10N = 10N=10).
| Participant | Caffeine (mg) | Deep sleep (mins) | Ranks of Caffeine (mg) | Ranks of Deep sleep (mins) |
|---|---|---|---|---|
| A | 150 | 110 | 4 | 7 |
| B | 50 | 140 | 1 | 9.5 |
| C | 200 | 95 | 5 | 5 |
| D | 350 | 70 | 8 | 3 |
| E | 100 | 140 | 2.5 | 9.5 |
| F | 100 | 120 | 2.5 | 8 |
| G | 300 | 80 | 7 | 4 |
| H | 450 | 45 | 10 | 1 |
| I | 250 | 100 | 6 | 6 |
| J | 400 | 60 | 9 | 2 |
Write the significance statement for the analysis performed on this data using Spearman's ranked correlation coefficient.
(Note: For this data, the calculated value of rs=−0.967r_s = -0.967rs=−0.967. For a two-tailed test where N=10N = 10N=10 and p≤0.05p \le 0.05p≤0.05, the critical value is 0.648.)
513 exam-style questions on OCR A Level Psychology Data recording, analysis and presentation. Each one has a worked solution and a mark scheme showing where the marks go.