Marine biologists investigated whether there is an association between the type of beach substrate where a species of crab is found and the physical condition of its shell. They surveyed three distinct coastal zones (Sandy, Muddy, and Rocky) and recorded whether each crab's shell was intact or damaged. The frequency of crabs in each category is shown in Table 1.
Table 1: Shell condition of crabs found across different beach substrates
| Sandy | Muddy | Rocky | |
|---|---|---|---|
| Intact Shell | 45 | 18 | 32 |
| Damaged Shell | 15 | 22 | 48 |
Identify a suitable statistical test that the biologists could use to analyse the data in Table 1. Justify your choice.
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.
