Elena is conducting an observational study to see if there is an association between a student's subject area (Science vs. Humanities) and their preferred study environment (Quiet Study vs. Group Study).
Complete Table 2 to calculate the chi-squared test statistic for Elena's study to two decimal places.
Table 2: Chi-squared calculation table
| Student Group | Preferred Environment | Observed (O) | Expected (E) | O-E | (O−E)2(O-E)^2(O−E)2 | (O−E)2/E(O-E)^2/E(O−E)2/E |
|---|---|---|---|---|---|---|
| Science | Quiet Study | 11 | 8.4 | |||
| Group Study | 3 | 5.6 | ||||
| Humanities | Quiet Study | 7 | 9.6 | |||
| Group Study | 9 | 6.4 | ||||
| Chi-squared (χ2\chi^2χ2) = |
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.