A psychologist carries out a laboratory experiment to investigate whether the colour of paper affects proofreading accuracy. Participants work alone in the same study room. Each participant receives the same passage containing 20 spelling errors, printed on either white or pale green paper. Everyone has four minutes to circle as many errors as possible.
Explain one strength of the laboratory experiment in this study.
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.