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Planning Psychological Research

Participants and sampling: Self-selected sampling

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  • Component 2

Overview

Recall questions on Participants and sampling: Self-selected sampling.

What you need to know

Answer each one before you reveal it.

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Evaluation

Give one strength and one weakness of event sampling.

Key term

What is event sampling in an observation?

Key term

Which observational sampling technique suits a behaviour that occurs rarely, and why?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is self-selected sampling?

    Model answer

    It means the participants volunteer themselves, typically by responding to an advertisement, a poster or an on-line appeal.

  2. 2

    Give one strength and one weakness of self-selected sampling.

    Model answer

    It is easy to arrange and yields committed participants who are less likely to drop out, but volunteers tend to share characteristics such as curiosity and eagerness to help, which is known as volunteer bias.

  3. 3

    What is snowball sampling?

    Model answer

    One participant who fits the criteria is recruited and then asked to put the researcher in touch with others they know who also fit, so the sample grows through personal contacts.

  4. 4

    When is snowball sampling especially useful, and what is its main drawback?

    Model answer

    It is useful for reaching hidden or hard-to-reach groups who have no available sampling frame, but because participants recruit people like themselves the sample is likely to be narrow and unrepresentative.

  5. 5

    What is event sampling in an observation?

    Model answer

    The observer counts every occurrence of a specified behaviour throughout the whole observation period.

  6. 6

    Give one strength and one weakness of event sampling.

    Model answer

    No instance of the target behaviour is missed, so the count is complete, but if the behaviour happens very frequently the observer may be overwhelmed and fail to record some of it.

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