Harrison conducted an experiment to investigate the effect of weapon focus on the accuracy of eyewitness testimony. He showed a sample of 20 university students a video of a bank robbery where the perpetrator held either a large kitchen knife (weapon condition) or a leather wallet (control condition). Harrison then used a structured questionnaire with closed questions to measure their recall of the perpetrator's facial details.
Explain one improvement Harrison could make to his experiment.
Practise Edexcel A Level Psychology Content with exam-style questions for A Level Psychology. 1,059 questions covering Diagnosis of mental disorders (4 Ds), Classification systems (DSM and ICD), Schizophrenia and one other disorder, Treatments for the two disorders, Individual differences, and Developmental psychology, matched to the Edexcel A Level Psychology (9PS0) 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.
