An environmental researcher conducted an observational study in a corporate office building to investigate whether the presence of a color-coded guidance sign near waste bins changed waste-sorting behaviour. They recorded whether employees sorted their waste correctly ('Correct sorting') or incorrectly ('Incorrect sorting') when using bins with the new guidance sign compared to bins with standard black-and-white text signs.
The researcher recorded the number of waste-disposal events during a one-week period. The data gathered is presented in the table below:
| Guidance Sign | Standard Sign | |
|---|---|---|
| Correct sorting | 84 | 45 |
| Incorrect sorting | 36 | 55 |
The researcher used the Chi-square test to analyse the data from this study.
Give one reason why this is the appropriate non-parametric statistical test to use.
513 exam-style questions on OCR A Level Psychology Data recording, analysis and presentation. Each one has a worked solution and a mark scheme showing where the marks go.