| Exam Board | OCR |
|---|---|
| Module | S2 (Statistics 2) |
| Year | 2009 |
| Session | June |
| Marks | 7 |
| Paper | Download PDF ↗ |
| Mark scheme | Download PDF ↗ |
| Topic | Modelling and Hypothesis Testing |
| Type | Sampling methods critique |
| Difficulty | Moderate -0.8 This is a straightforward S2 question testing basic understanding of sampling methods and bias. It requires recall of standard sampling issues (convenience sampling, non-representative samples) and textbook solutions (random sampling, representative samples) with no calculation or novel reasoning required. Easier than average A-level questions which typically involve some problem-solving or calculation. |
| Spec | 2.01c Sampling techniques: simple random, opportunity, etc2.01d Select/critique sampling: in context |
4 A survey is to be carried out to draw conclusions about the proportion $p$ of residents of a town who support the building of a new supermarket. It is proposed to carry out the survey by interviewing a large number of people in the high street of the town, which attracts a large number of tourists.\\
(i) Give two different reasons why this proposed method is inappropriate.\\
(ii) Suggest a good method of carrying out the survey.\\
(iii) State two statistical properties of your survey method that would enable reliable conclusions about $p$ to be drawn.
\hfill \mbox{\textit{OCR S2 2009 Q4 [7]}}