State two reasons why the researchers in the environmental action study used a chi-squared test to analyse their data in Table 3.
| Signed the petition | Did not sign the petition | |
|---|---|---|
| Young Adults (N = 60) | 42 | 18 |
| Older Adults (N = 60) | 30 | 30 |
638 exam-style questions on Edexcel A Level Psychology Methods. Each one has a worked solution and a mark scheme showing where the marks go.