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 Issues around drug taking, Biological explanations of drug addiction, Learning explanations of drug addiction, Treatments for drug addiction, Anti-drug campaign and strategies, 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.
