| Exam Board | OCR |
|---|---|
| Module | S2 (Statistics 2) |
| Year | 2011 |
| Session | January |
| Paper | Download PDF ↗ |
| Mark scheme | Download PDF ↗ |
| Topic | Chi-squared test of independence |
| Type | Standard 2×3 contingency table |
| Difficulty | Moderate -0.5 This is a standard chi-squared test of independence from S2, requiring routine calculation of expected frequencies, test statistic, and comparison with critical values. While it involves multiple steps, it follows a well-practiced algorithm with no conceptual challenges beyond textbook exercises, making it slightly easier than average. |
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\hfill \mbox{\textit{OCR S2 2011 Q10}}