An agricultural scientist investigated the impact of a new organic soil conditioner on the yield of heritage tomato plants using a matched-pairs design. After calculating the difference in yield for each pair, there were 16 pairs with non-zero differences (N=16N = 16N=16). The calculated Wilcoxon test statistic was found to be T=32T = 32T=32.
Using Table 1 below, explain whether or not the results of this study are significant at the 5% level for a two-tailed test.
| NNN | Significant at 0.10 level (two-tailed) | Significant at 0.05 level (two-tailed) | Significant at 0.01 level (two-tailed) |
|---|---|---|---|
| 15 | 30 | 25 | 15 |
| 16 | 35 | 29 | 19 |
| 17 | 41 | 34 | 23 |
| 18 | 47 | 40 | 27 |
| 19 | 53 | 46 | 32 |
| 20 | 60 | 52 | 37 |
Note: To be significant, the calculated value of T T\,T must be equal to or less than the critical value shown in the table.
Practise AQA A Level Psychology Inferential testing (A-level only) with exam-style questions for A Level Psychology. 123 questions, matched to the AQA A Level Psychology (7182) 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.
