An environmental study compared the recovery of river water quality downstream of two different wastewater treatment facilities (Plant A and Plant B). The concentration of Dissolved Oxygen (DO) was measured at regular distances downstream from each plant's discharge point. A higher DO indicates healthier water. The results are shown in the graph and table below.
| Distance Downstream (km) | Plant A (Dissolved Oxygen in mg/L) | Plant B (Dissolved Oxygen in mg/L) |
|---|---|---|
| 0 | 2.0 | 2.0 |
| 2 | 3.5 | 2.2 |
| 4 | 5.0 | 2.4 |
| 6 | 6.5 | 3.0 |
| 8 | 8.0 | 5.5 |
| 10 | 9.0 | 8.0 |
| 12 | 9.0 | 9.0 |
| 14 | 9.0 | 9.0 |
What conclusions about the environmental recovery of the river water downstream of these two facilities can you draw from the data?
Practise AQA A Level Psychology Data handling and analysis with exam-style questions for A Level Psychology. 263 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.
