A criminological psychologist investigated whether the presence of a visible weapon affected the number of correct details recalled by eyewitnesses. She conducted a Mann–Whitney U test on her data. The calculated/observed value of U U\,U was 14, and the critical value of U U\,U for a two-tailed hypothesis at p≤0.05 p \le 0.05\,p≤0.05 was 19.
Determine whether the psychologist's results are statistically significant.
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.
