An environmental scientist wants to investigate the relationship between the density of the tree canopy and the biodiversity of the forest floor in ancient woodlands. They randomly select 10 different woodland sites of similar elevation and soil type. At each site, they record two measurements:
The following results were obtained:
Table 1: Canopy cover and understory species richness across ten woodland sites
| Woodland Site | Canopy Cover (%) | Species Richness |
|---|---|---|
| A | 85 | 12 |
| B | 40 | 28 |
| C | 65 | 19 |
| D | 90 | 8 |
| E | 30 | 32 |
| F | 55 | 22 |
| G | 75 | 15 |
| H | 45 | 25 |
| I | 60 | 18 |
| J | 20 | 35 |
The scientist decides to analyse the data using a Spearman's rank correlation coefficient test.
Explain why this is a suitable choice of statistical test for this investigation.
Practise AQA A Level Psychology Inferential testing (A-level only) with exam-style questions for A Level Psychology. 123 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.
