A clinical psychologist wants to investigate whether a new mindfulness app reduces self-reported anxiety. She measures the anxiety levels of 12 patients using a 10-point rating scale (where 10 represents extreme anxiety, treated as ordinal data) both before they start using the app and after they have used it for one week.
Which of these would be the appropriate inferential test to analyse the difference in anxiety ratings?
Mann-Whitney U test
Wilcoxon Signed Ranks test
Related t-test
Sign test
644 exam-style questions on OCR A Level Psychology Research methods and techniques. Each one has a worked solution and a mark scheme showing where the marks go.