An agricultural researcher is comparing the yield of two organic fertilisers, 'BioGrow' (Fertiliser A) and 'NutriSoil' (Fertiliser B), on tomato crop yields. Twelve matched pairs of plots were treated, and the weight of tomatoes harvested (in kg) from each plot was recorded in the table below.
| Fertiliser A (BioGrow) | Fertiliser B (NutriSoil) | |
|---|---|---|
| Pair 1 | 24.5 | 21.2 |
| Pair 2 | 18.2 | 18.2 |
| Pair 3 | 30.1 | 32.4 |
| Pair 4 | 15.6 | 19.8 |
| Pair 5 | 22.8 | 20.1 |
| Pair 6 | 27.4 | 27.4 |
| Pair 7 | 19.9 | 23.5 |
| Pair 8 | 31.2 | 28.9 |
| Pair 9 | 25.3 | 26.1 |
| Pair 10 | 17.5 | 17.5 |
| Pair 11 | 29.8 | 26.4 |
| Pair 12 | 21.0 | 24.6 |
Calculate the value of S S\,S in this study. Show your workings.
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.
