During a physical geography fieldwork investigation, a student group assesses the ecological health of a river channel at various sampling sites. At each site, they record their observations using the bipolar assessment scale shown below.
| Parameter | -3 | -2 | -1 | 0 | +1 | +2 | +3 | Parameter |
|---|---|---|---|---|---|---|---|---|
| High channelisation / artificial banks | ✓ | Natural, highly meandering channel | ||||||
| Extreme water turbidity / suspended sediment | ✓ | Crystal clear water / low turbidity | ||||||
| Depleted riparian vegetation / concrete margins | ✓ | Dense riparian woodland buffer zone | ||||||
| Heavy plastic pollution and surface debris | ✓ | No visible litter or pollution debris |
Using the data from this completed field sheet, state one appropriate data presentation technique that the students could use to display this bipolar environmental quality dataset.
