Complete Table 2 and calculate the Mann-Whitney U U\,U value for the results of Elena's investigation.
Use the following formulas for the Mann-Whitney U U\,U test:
Ua=nanb+na(na+1)2−Ra U_a = n_a n_b + \frac{n_a(n_a + 1)}{2} - R_a Ua=nanb+2na(na+1)−Ra Ub=nanb+nb(nb+1)2−Rb U_b = n_a n_b + \frac{n_b(n_b + 1)}{2} - R_b Ub=nanb+2nb(nb+1)−Rbwhere:
Table 2:
| Condition A: Silent study room | Condition B: Lyrical background music | ||
|---|---|---|---|
| Reading score (out of 15) | Rank | Reading score (out of 15) | Rank |
| 12 | 14 | 8 | 5 |
| 14 | 18.5 | 10 | 9.5 |
| 11 | 11.5 | 9 | 7.5 |
| 13 | 16.5 | 8 | 5 |
| 15 | 20 | 9 | 7.5 |
| 12 | 14 | 12 | 14 |
| 11 | 11.5 | 7 | 3 |
| 10 | 9.5 | 8 | 5 |
| 13 | 16.5 | 6 | 2 |
| 14 | 18.5 | 5 | 1 |
| Total | 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.