Agricultural scientists investigated the relationship between the daily aeration duration of a nutrient solution in a hydroponic system and the final dry root mass of a specific crop. They monitored 9 independent growing chambers.
Set 1: The daily automated aeration duration (AAA, in minutes, up to a maximum recommended 30 minutes).
Set 2: The dry root mass yield of the crop (MMM, in grams) measured after a standard 30-day growth cycle.
Table 1: Aeration duration and dry root mass yield
| Growing Chamber | Aeration duration (A A\,A minutes) | Dry root mass yield (M M\,M grams) |
|---|---|---|
| 1 | 28 | 18.5 |
| 2 | 8 | 5.0 |
| 3 | 22 | 15.0 |
| 4 | 15 | 11.2 |
| 5 | 5 | 3.1 |
| 6 | 12 | 14.8 |
| 7 | 10 | 6.2 |
| 8 | 25 | 8.5 |
| 9 | 30 | 19.8 |
Using the data in Table 1, comment on the relationship between the daily aeration duration and the final dry root mass yield of the crop.
19 exam-style questions on AQA A Level Psychology Correlations. Each one has a worked solution and a mark scheme showing where the marks go.