A psychologist investigated the effectiveness of Systematic Desensitisation (SD) as a treatment for arachnophobia. Table 1 shows the anxiety reduction scores (measured using a standardised scale where a higher score indicates greater reduction in anxiety) for participants in Group A.
Table 1 Anxiety reduction scores for participants in Group A (Systematic Desensitisation)
| Participant number | Anxiety reduction score |
|---|---|
| 1 | 5 |
| 2 | 9 |
| 3 | 4 |
| 4 | 11 |
| 5 | 3 |
| 6 | 12 |
| 7 | 5 |
| 8 | 8 |
Calculate the mean anxiety reduction score for Group A. Give your answer to two significant figures. Show your workings.
235 exam-style questions on AQA A Level Psychology Data handling and analysis. Each one has a worked solution and a mark scheme showing where the marks go.