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Data Recording, Analysis and Presentation

Representativeness, generalisability and types of reliability

  • 3 things to know
  • Component 01

Overview

Recall questions on representativeness and generalisability, internal and external reliability, inter-rater, test-retest and split-half reliability, and ways to improve the reliability of observations and questionnaires.

What you need to know

Answer each one before you reveal it.

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Evaluation

What is generalisability?

Evaluation

How is test-retest reliability assessed?

Evaluation

Suggest one way of improving the reliability of an observation.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is meant by representativeness?

    Model answer

    The extent to which a sample reflects the characteristics of the target population it was drawn from.

  2. 2

    What is generalisability?

    Model answer

    The extent to which the findings of a study can be applied beyond the sample to other people, settings or times.

  3. 3

    Explain why poor representativeness limits generalisability.

    Model answer

    If the sample does not reflect the population, conclusions drawn from it may not hold true for anyone outside the study.

  4. 4

    Define reliability.

    Model answer

    The consistency of a measure or of a set of findings, so that repeating the measurement under the same conditions gives the same result.

  5. 5

    What is internal reliability?

    Model answer

    The extent to which a measure is consistent within itself, with all of its items measuring the same thing.

  6. 6

    What is external reliability?

    Model answer

    The extent to which a measure produces consistent results when it is used again on separate occasions.

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