A researcher uses the same structured interview question to ask two groups of 30 adults about littering. Each adult is interviewed face to face.
Interviewer A uses a neutral tone and expression. Interviewer B asks the same question in a disapproving tone and frowns while the adult answers.
| Interviewer | Mean number of times adults reported leaving litter in a public place during the previous four weeks |
|---|---|
| A | 1.8 |
| B | 0.6 |
Explain how bias could account for the difference between the two mean reports and what this means for the validity of the data.
Suggest one change the researcher could make to reduce bias in a repeat interview. Explain why this change should reduce bias.
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.