| Exam Board | Edexcel |
|---|---|
| Module | S2 (Statistics 2) |
| Marks | 6 |
| Paper | Download PDF ↗ |
| Mark scheme | Download PDF ↗ |
| Topic | Data representation |
| Type | Critique given sampling method |
| Difficulty | Easy -1.8 This is a straightforward conceptual question testing basic understanding of sampling terminology and principles. It requires only recall of definitions (sampling frame, sampling units) and recognition of obvious bias (one shelf is not representative), with no calculations or problem-solving required. |
| Spec | 2.01a Population and sample: terminology2.01b Informal inferences: from samples2.01c Sampling techniques: simple random, opportunity, etc2.01d Select/critique sampling: in context |
| Answer | Marks |
|---|---|
| (a) Quicker to use a sample, but it may be inaccurate | B1 B1 |
| (b) Catalogue of all videos in stock | B1 |
| (c) All the separate videos | B1 |
| (d) One particular sort, e.g. horror, may be unrepresentative | B2 |
(a) Quicker to use a sample, but it may be inaccurate | B1 B1 |
(b) Catalogue of all videos in stock | B1 |
(c) All the separate videos | B1 |
(d) One particular sort, e.g. horror, may be unrepresentative | B2 |
**Total: 6 marks**
---2. A video rental shop needs to find out whether or not videos have been rewound when they are returned; it will do this by taking a sample of returned videos
\begin{enumerate}[label=(\alph*)]
\item State one advantage and one disadvantage of taking a sample.
\item Suggest a suitable sampling frame.
\item Describe the sampling units.
\item Criticise the sampling method of looking at just one particular shelf of videos.
\end{enumerate}
\hfill \mbox{\textit{Edexcel S2 Q2 [6]}}