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Sampling, Ethics and Practical Issues

Quota sampling

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

Overview

Recall questions on how quotas are filled, why no sampling frame is needed, who gets missed on the street, the bias interviewers introduce, and when the results still hold up.

What you need to know

Answer each one before you reveal it.

Your recallNot started
Key term

What is quota sampling?

Key term

Give one reason quota sampling does not require a sampling frame.

Evaluation

Explain the main weakness of quota sampling.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is quota sampling?

    Model answer

    A method in which interviewers are told how many people of each category to interview and choose those people themselves.

  2. 2

    How does quota sampling differ from stratified random sampling?

    Model answer

    Both fix the proportions of each category, but quota sampling lets the interviewer pick the individuals rather than selecting them at random.

  3. 3

    Give one reason quota sampling does not require a sampling frame.

    Model answer

    Respondents are recruited on the spot until each quota is filled, so no list of the population is needed.

  4. 4

    State two practical advantages of quota sampling.

    Model answer

    It is quick and cheap, and it can be used where no sampling frame exists.

  5. 5

    Explain the main weakness of quota sampling.

    Model answer

    Interviewers choose who to approach, so their preferences bias the sample and no claim about probability can be made.

  6. 6

    Why is quota sampling described as a non-probability method?

    Model answer

    Because the chance of any individual being selected is unknown, so statistical confidence cannot be calculated.

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