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Planning Psychological Research

Participants and sampling: Target populations, Sampling frames and Opportunity sampling

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Overview

Recall questions on Target populations, Sampling frames and Opportunity sampling.

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Key term

Why does an incomplete sampling frame threaten a study?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is a target population?

    Model answer

    It is the whole group of people the researcher is interested in and to whom they wish to apply their findings.

  2. 2

    What is a sampling frame?

    Model answer

    It is the actual list of the members of the target population from which the sample is drawn, such as a school roll or a membership register.

  3. 3

    Why does an incomplete sampling frame threaten a study?

    Model answer

    Anyone missing from the list has no chance of being selected, so the sample is biased before selection even begins and the findings cannot be generalised to the whole target population.

  4. 4

    What makes a sample representative, and why does it matter?

    Model answer

    A representative sample reflects the important characteristics of the target population in the same proportions, which is what allows the findings to be generalised beyond the people actually tested.

  5. 5

    How is a random sample obtained?

    Model answer

    Every member of the sampling frame is given an equal chance of selection, for example by numbering the whole list and using a random number generator or lottery method to pick the required number.

  6. 6

    Give one strength and one weakness of random sampling.

    Model answer

    It is free from researcher bias and is the most likely method to produce a representative sample, but it requires a complete list of the population and by chance can still yield an unrepresentative group.

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