Dr Aris conducted an experiment to investigate whether blue-light filtering glasses affected performance on a visual search task. He compared a group of participants who wore blue-light filtering glasses (Group A) with a group of participants who wore standard clear-lens glasses (Group B).
Dr Aris measured performance by counting the number of targets successfully identified in a 30-second computerised trial. The higher the score, the better the participant's visual search performance.
The results are shown in Table 3.
Calculate the range for Group B and complete Table 3 with your answer.
| Group A | Group B |
|---|---|
| Number of targets identified (blue-light filtering) | Number of targets identified (clear-lens) |
| 14 | 11 |
| 16 | 15 |
| 15 | 8 |
| 13 | 19 |
| 17 | 12 |
| 14 | 7 |
| 15 | 16 |
| 18 | 14 |
| 16 | 18 |
| 15 | 10 |
| Range = 5 | Range = |
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.