At the start of a study, five pupils complete a reasoning test scored out of 80. Over the next six months, the psychologist records the average number of minutes each pupil spends solving puzzles each week. The pupils complete another reasoning test at the end of the study.
| Pupil | Puzzle-solving each week (minutes) | Score at start (out of 80) | Score at end (out of 80) |
|---|---|---|---|
| A | 0 | 43 | 46 |
| B | 25 | 51 | 52 |
| C | 50 | 55 | 59 |
| D | 80 | 64 | 66 |
| E | 120 | 71 | 73 |
The psychologist considers two interpretations:
Using all of the results, explain which interpretation is better supported and why a causal conclusion is still not justified.
139 exam-style questions on OCR GCSE Psychology 7.2 Doing Research, covering 7.2.1 Experiments, 7.2.2 Interviews, 7.2.3 Questionnaires (Surveys), 7.2.4 Observations, 7.2.5 Case Studies, and 7.2.6 Correlations. Each one has a worked solution and a mark scheme showing where the marks go.