Calculate the correlation coefficient for the data collected in this study on daily water intake and concentration. Use the formula for Spearman's ranked correlation coefficient presented below. Show your workings.
rs=1−6(∑d2)n(n2−1) r_s = 1 - \frac{6(\sum d^2)}{n(n^2-1)} rs=1−n(n2−1)6(∑d2)Concentration and Hydration Study Data
| Participant | Daily Water Intake (litres) | Concentration Score (1–100) | Rank: Water Intake | Rank: Concentration Score |
|---|---|---|---|---|
| A | 0.8 | 45 | 1 | 1 |
| B | 1.2 | 52 | 2 | 2 |
| C | 1.5 | 60 | 3 | 4 |
| D | 1.8 | 58 | 4 | 3 |
| E | 2.0 | 72 | 5 | 6 |
| F | 2.2 | 68 | 6 | 5 |
| G | 2.5 | 85 | 7 | 8 |
| H | 3.0 | 80 | 8 | 7 |
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.