A researcher conducted a practical investigation in criminological psychology to examine whether the presence of a weapon (the weapon focus effect) affects the accuracy of eyewitness identification. They showed 30 participants a slideshow of a crime scene where an offender held either a gun or a pen, and later asked them to identify the offender from a line-up.
Explain one improvement the researcher could make to the reliability of this practical investigation.
Practise Edexcel A Level Psychology Research methods and skills with exam-style questions for A Level Psychology. 657 questions covering Research methods and skills, 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.
