An agricultural scientist is conducting a trial to compare the effectiveness of two different fertilizers on the crop yield of heirloom tomato plants. 60 identical young tomato saplings are prepared for the trial.
The two treatments are:
The table below shows the mean initial height of the saplings and their final mean yield after 12 weeks.
| Treatment Group | Mean initial sapling height (cm) | Mean tomato yield per plant (kg) |
|---|---|---|
| Group A (BioGrow) | 15.4 | 4.8 |
| Group B (NutriChem) | 15.5 | 5.2 |
Explain how the scientist could allocate the 60 tomato saplings randomly to the two treatment groups to ensure a fair test.
689 exam-style questions on AQA A Level Psychology Scientific processes. Each one has a worked solution and a mark scheme showing where the marks go.