Dr. Vance conducted an empirical study investigating the weapon focus effect in eyewitness testimony. He explored the relationship between the type of weapon visible in a mock crime video clip (classified as 'knife' or 'handgun') and the witness's overall accuracy in describing the perpetrator's clothing (classified as 'accurate' or 'inaccurate').
State three reasons why Dr. Vance would use a Chi-Square test of association to analyze his data.
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.
