A-level · Statistical sampling

Non-random sampling — quota and opportunityExam-style questions

The two sampling methods that don't use chance: quota sampling (fill preset quotas for each group, choosing respondents non-randomly) and opportunity (or convenience) sampling (use whoever is available). How they work, when they're used, and why quota is not the same as stratified sampling.

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6 questions · A-level level · mark scheme and worked solution on each · no sign-up to try

DifficultyAllLevel 2Level 3
  1. 1
    State one advantage and one disadvantage of quota sampling.
    Level 3 · 2 marksTry it
  2. 2
    A student surveys her friends about a new app and reports the result as representative of all students. Identify the sampling method and explain why the conclusion may be unreliable.
    Level 3 · 2 marksTry it
  3. 3
    A researcher interviews the first 3030 people leaving a supermarket. State the sampling method used and one disadvantage.
    Level 3 · 2 marksTry it
  4. 4
    Give one reason a market researcher might prefer quota sampling to a stratified random sample.
    Level 3 · 1 markTry it