A psychologist used a questionnaire to assess the sleep disturbance scores of night-shift nurses.

| Group | Pre-intervention sleep disturbance score | Post-intervention sleep disturbance score |
|---|---|---|
| Group A (Blue-light Glasses) | 78 | 52 |
| Group B (Sleep Masks) | 75 | 48 |
Briefly discuss one strength of using questionnaires in this research.
Practise AQA A Level Psychology Self-report techniques with exam-style questions for A Level Psychology. 40 questions, matched to the AQA A Level Psychology (7182) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.