A marine biologist investigated whether a specific species of sea anemone (Actinia equina) shows a preference for settling on granite substrate compared to sandstone substrate. They conducted a Chi-squared test for independence to analyze the distribution frequencies of the anemones.
Directly below is the calculated value of chi-squared and the table of critical values:
Table 1: Critical values for the chi-squared test
| df | 0.10 | 0.05 | 0.02 | 0.01 |
|---|---|---|---|---|
| 1 | 2.71 | 3.84 | 5.41 | 6.64 |
Note: The calculated value of chi-squared must be equal to or greater than the critical value to be statistically significant.
With reference to the critical values in Table 1, explain whether or not the calculated value of chi-squared is significant at the 5% level.
121 exam-style questions on AQA A Level Psychology Inferential testing (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.