Marine biologists conducted an observational study to investigate whether two species of micro-crustaceans (Copepods and Amphipods) show a preference for settling on different artificial substrates used in coastal restoration. They monitored settlement chambers containing two types of substrate: textured bio-mesh and smooth polymer plates.
Over a 48-hour monitoring period, the researchers recorded the species of each settling organism and the substrate type selected. The observed frequencies are presented in the table below:
| Copepods | Amphipods | |
|---|---|---|
| Textured bio-mesh | 45 | 18 |
| Smooth polymer plates | 22 | 35 |
What does the analysis from the Chi-square test of association inform us regarding the settlement of the two species of micro-crustaceans on the two different substrate types in this study?
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.