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.
51 exam-style questions on Edexcel A Level Psychology Research methods and skills, covering Research methods and skills. Each one has a worked solution and a mark scheme showing where the marks go.