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Principles of Research and Application of Research Methods

Methodologies: experiments, quasi-experiments and participant observations

  • 2 things to know
  • AS Unit 2

Overview

Recall questions on quasi-experiment, natural experiment and participant observation.

What you need to know

Answer each one before you reveal it.

Your recallNot started
Key term

What makes a study an experiment?

Key term

Why can a quasi-experiment not establish cause and effect with confidence?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What makes a study an experiment?

    Model answer

    The researcher manipulates an independent variable, measures a dependent variable and controls other variables, so that a causal conclusion can be drawn.

  2. 2

    Give one strength and one weakness of the experimental method.

    Model answer

    Its control over variables allows cause and effect to be established, but that same control makes the situation artificial so behaviour may not reflect real life.

  3. 3

    What is a quasi-experiment?

    Model answer

    A study in which the independent variable is a pre-existing characteristic of the participants, such as age, sex or having a phobia, that the researcher cannot manipulate.

  4. 4

    Why can a quasi-experiment not establish cause and effect with confidence?

    Model answer

    Participants cannot be randomly allocated to conditions, so differences between the groups themselves may explain the results rather than the independent variable.

  5. 5

    What is a natural experiment?

    Model answer

    A study in which the independent variable changes of its own accord or is changed by someone other than the researcher, who simply measures the effect on the dependent variable.

  6. 6

    Give one strength and one weakness of natural experiments.

    Model answer

    They allow the study of variables that could never be manipulated ethically or practically, but the events are rare, cannot be repeated to order and leave extraneous variables uncontrolled.

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