A sports psychologist wanted to investigate whether a mindfulness intervention reduces pre-competition anxiety in competitive swimmers. She randomly allocated 16 swimmers to one of two independent groups: Group A (mindfulness training) or Group B (a control relaxation reading). After two weeks, all swimmers completed a self-report anxiety scale rated from 1 (completely calm) to 20 (extremely anxious).
The results of the study are shown in Table 1 below.
| Group A (Mindfulness) | Group B (Control) |
|---|---|
| 5 | 14 |
| 8 | 11 |
| 4 | 17 |
| 12 | 13 |
| 7 | 15 |
| 10 | 9 |
| 6 | 16 |
| 9 | 12 |
Which inferential statistical test should be used to analyse the differences in anxiety scores between the two groups?
Wilcoxon Signed Ranks test
Sign test
Mann-Whitney U test
Spearman's rank correlation coefficient
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.