Dr Taylor wanted to investigate whether there was a correlation between daily coffee consumption and self-reported productivity levels among research students.
She randomly selected six students working in a university library who kept detailed logs of their daily intake. At the end of a typical working day, she recorded the number of cups of coffee they consumed and asked them to rate their average productivity.
Dr Taylor asked the students to rate their productivity on a scale of 1 to 5 (where 1 was very unproductive and 5 was highly productive).
The results of Dr Taylor's study are shown in Table 1.
| Participant | Daily coffee (cups) | Self-reported productivity score |
|---|---|---|
| A | 4 | 4 |
| B | 1 | 2 |
| C | 3 | 3 |
| D | 5 | 5 |
| E | 2 | 2 |
| F | 3 | 2 |
Complete Table 2 and calculate Spearman's rank correlation coefficient between the daily coffee consumption and the self-reported productivity score. Round your final answer to two decimal places.
| Daily coffee (cups) | Rank 1 | Self-reported productivity score | Rank 2 | ddd | d2d^2d2 |
|---|---|---|---|---|---|
| 4 | 5 | 4 | 5 | ||
| 1 | 1 | 2 | 2 | ||
| 3 | 3.5 | 3 | 4 | ||
| 5 | 6 | 5 | 6 | ||
| 2 | 2 | 2 | 2 | ||
| 3 | 3.5 | 2 | 2 | ||
| 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.