The results of a clinical trial investigating the efficacy of a new insomnia treatment are shown in Table 1.
| Improved Sleep Quality | No Improvement | |
|---|---|---|
| Treatment Group | 54 | 18 |
| Control Group | 22 | 66 |
Which of A, B, C or D is the correct percentage of all participants in the study who reported improved sleep quality?
Shade one box only.
25.0%25.0\%25.0%
47.5%47.5\%47.5%
52.5%52.5\%52.5%
75.0%75.0\%75.0%
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.