A council pilots a questionnaire about a local swimming pool with 40 residents. The questionnaire includes the item:
"Surely you agree that the convenient opening times and affordable entry fee make the local swimming pool easy to use?"
The same residents also answer two separate questions. Their responses are shown in the table.
| Question | Yes/Agree | No/Disagree |
|---|---|---|
| Combined questionnaire item | 30 | 10 |
| Are the swimming pool's opening times convenient for you? | 12 | 28 |
| Is the swimming pool's entry fee affordable for you? | 31 | 9 |
Explain two reasons why the combined questionnaire item may not collect valid data. Use the pilot results in your answer.
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.