Dr. Aris conducted a Wilcoxon Signed-Ranks test on health psychology data evaluating nicotine dependence scores in a cohort of smokers before and after a six-week cognitive-behavioural intervention. The calculated (observed) value of T T\,T was 8.
The critical value of T T\,T at the p≤0.05 p \le 0.05\,p≤0.05 level of significance for a directional (one-tailed) hypothesis where N=12N = 12N=12 is 17.
Determine whether Dr. Aris's results were statistically significant. Justify your answer.
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.
