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Sampling, Ethics and Practical Issues

Purposive and opportunity sampling

  • 3 things to know
  • AS Unit 2 and A2 Unit 4

Overview

Purposive sampling, opportunity sample and two advantages of opportunity sampling.

What you need to know

Answer each one before you reveal it.

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Key term

Explain opportunity sampling, and how it differs from choosing people for a stated reason.

Key term

What is purposive sampling?

Key term

Give an example of purposive sampling in an educational study.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is purposive sampling?

    Model answer

    Deliberately selecting participants because they have characteristics the research question requires.

  2. 2

    Give an example of purposive sampling in an educational study.

    Model answer

    Choosing to interview only the pupils excluded from a school, because the study is about exclusion.

  3. 3

    Why is purposive sampling common in qualitative research?

    Model answer

    Depth of understanding depends on studying people who have direct experience of the issue, not on statistical typicality.

  4. 4

    State the main criticism of purposive sampling.

    Model answer

    The researcher decides who counts as relevant, so their judgement rather than chance determines the sample.

  5. 5

    What is an opportunity sample?

    Model answer

    A sample made up of whoever is available and willing at the time and place of the research.

  6. 6

    Give one situation in which an opportunity sample is a reasonable choice.

    Model answer

    A small student project with no budget, where the aim is to trial a method rather than to generalise.

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