Dr Vance conducted an investigation to determine whether a new mindfulness training programme reduces self-reported anxiety severity (measured on an ordinal rating scale from 0 to 50) in emergency call handlers. The anxiety levels of 15 call handlers were assessed both before and after completing the 4-week programme. Dr Vance selected a Wilcoxon signed-ranks test to analyse the data.
State three reasons why Dr Vance would use a Wilcoxon signed-ranks test for this study.
Practise Edexcel A Level Psychology Methods with exam-style questions for A Level Psychology. 638 questions, 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.