Marcus carried out a cognitive psychology experiment investigating the effect of noise on working memory. He tested 10 participants on a visual recall task under two conditions: Condition 1 (with background noise) and Condition 2 (in silence). Marcus decided to carry out a statistical test on his data using a Wilcoxon Signed Ranks test.
Complete Table 1 and calculate the observed value of T T\,T for Marcus's data.
Table 1
| Participant | Number of shapes recalled in Condition 1 (with background noise) | Number of shapes recalled in Condition 2 (in silence) | Difference | Rank | Rank if positive | Rank if negative |
|---|---|---|---|---|---|---|
| A | 12 | 15 | ||||
| B | 10 | 10 | ||||
| C | 14 | 18 | ||||
| D | 11 | 12 | ||||
| E | 15 | 21 | ||||
| F | 13 | 12 | ||||
| G | 9 | 17 | ||||
| H | 7 | 16 | ||||
| I | 16 | 14 | ||||
| J | 8 | 19 | ||||
| Total: |
186 exam-style questions on Edexcel A Level Psychology Research methods and skills, covering Research methods and skills. Each one has a worked solution and a mark scheme showing where the marks go.