An agricultural scientist is investigating whether two different organic nutrient formulations, VitalGrow (VVV) and FloraMax (FFF), lead to different dry biomass yields in hydroponically grown microgreens. Eight trays of microgreens are grown using VitalGrow, and another eight trays are grown under identical conditions using FloraMax. After 14 days, the dry biomass (in grams) of each tray is harvested and recorded. The data and their corresponding ranks are shown in the table below:
| Dry biomass yields (grams) | FloraMax (FFF) group | ||||
|---|---|---|---|---|---|
| VitalGrow (VVV) group | |||||
| Tray | Biomass | Rank | Tray | Biomass | Rank |
| 1 | 14.2 | 9 | 1 | 12.1 | 3 |
| 2 | 16.5 | 15 | 2 | 13.0 | 5 |
| 3 | 11.8 | 2 | 3 | 11.0 | 1 |
| 4 | 13.5 | 7 | 4 | 15.8 | 13 |
| 5 | 14.8 | 11 | 5 | 12.6 | 4 |
| 6 | 15.2 | 12 | 6 | 13.2 | 6 |
| 7 | 16.1 | 14 | 7 | 14.0 | 8 |
| 8 | 17.0 | 16 | 8 | 14.5 | 10 |
| n1=8n_1 = 8n1=8 | n2=8n_2 = 8n2=8 |
Explain what p≤0.01 p \le 0.01\,p≤0.01 would mean if it appeared as part of the significance statement when reporting the findings from this study.
513 exam-style questions on OCR A Level Psychology Data recording, analysis and presentation. Each one has a worked solution and a mark scheme showing where the marks go.