Marcus conducted an investigation into the effectiveness of a mindfulness smartphone app on reducing stress. He measured participants' self-reported stress levels on a scale of 1 to 10 (where 10 is extremely stressed) both before starting to use the app (Condition A) and after two weeks of daily app usage (Condition B).
Marcus's results are shown in Table 1 below.
Complete Table 1 and calculate the Wilcoxon Signed Ranks test statistic (TTT) for Marcus's data.
| Participant | Condition A: Stress Before | Condition B: Stress After | Difference | Rank | Rank if positive (+) | Rank if negative (-) |
|---|---|---|---|---|---|---|
| A | 8 | 5 | ||||
| B | 6 | 6 | ||||
| C | 9 | 4 | ||||
| D | 5 | 7 | ||||
| E | 7 | 3 | ||||
| F | 4 | 3 | ||||
| G | 8 | 2 | ||||
| Total: |
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.