A psychologist records the number of days in one school week (Monday to Friday) on which each pupil ate breakfast before school, and the pupil's score on an attention task.
| Pupil | Days breakfast was eaten (out of 5) | Attention task score out of 20 |
|---|---|---|
| A | 1 | 8 |
| B | 2 | 10 |
| C | 3 | 12 |
| D | 4 | 15 |
| E | 5 | 17 |
State the type of correlation shown by the results.
Suggest one other variable that could have affected both how often pupils ate breakfast and their attention task scores.
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.