Research in environmental psychology suggests that background audio can significantly influence cognitive performance. A researcher designed an independent measures experiment to compare the focus scores (on a scale of 0 to 30) of participants working in two different auditory conditions: listening to Lo-fi beats versus Classical music. Some of the raw scores and their corresponding combined ranks are presented in the table below.
| Focus scores (0 to 30) under different auditory conditions (0 = 'unable to focus' to 30 = 'highly focused') | Classical music | ||
|---|---|---|---|
| Lo-fi beats | Classical music | ||
| Score | Rank | Score | Rank |
| 18 | 12.5 | 12 | 6 |
| 25 | 17 | 3 | 1 |
| 13 | 7 | 18 | 12.5 |
| 18 | 12.5 | 6 | 3 |
| 15 | 9 | 14 | 8 |
| 29 | 19 | 18 | 12.5 |
| 8 | 4 | 5 | 2 |
| 21 | 15 | 16 | 10 |
| 30 | 20 | 23 | 16 |
| 27 | 18 | 10 | 5 |
Explain why there are four ranks of 12.5.
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.