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Research Methods and Techniques

Evaluating experiments: validity, control and realism

  • 3 things to know
  • Component 01

Overview

Recall questions on internal and ecological validity, mundane realism, identifying field experiments, replication, demand characteristics, ethical problems particular to field experiments, and why tighter control can reduce the usefulness of experimental findings.

What you need to know

Answer each one before you reveal it.

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Study

Why is replication easier in a laboratory experiment than in a quasi experiment?

Study

Explain why increasing control in an experiment can reduce the usefulness of its findings.

Key term

What does it mean to say a study has high internal validity?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What does it mean to say a study has high internal validity?

    Model answer

    Any change observed in the dependent variable is genuinely caused by the manipulated independent variable rather than by extraneous variables.

  2. 2

    What is meant by ecological validity?

    Model answer

    The extent to which the findings of a study can be applied to real-life settings and everyday behaviour.

  3. 3

    What is mundane realism, and why do laboratory tasks often lack it?

    Model answer

    It is the degree to which the task resembles activities carried out in everyday life, and laboratory tasks are often contrived so that they can be tightly controlled.

  4. 4

    One team studies driver behaviour at a real road junction and another in a driving simulator. Which is the field experiment, and why?

    Model answer

    The junction study, because the independent variable is manipulated in the drivers' own everyday environment rather than in a contrived setting.

  5. 5

    Why is replication easier in a laboratory experiment than in a quasi experiment?

    Model answer

    Laboratory procedures are standardised and can be repeated exactly, whereas the naturally occurring groups and conditions of a quasi experiment may never recur in the same form.

  6. 6

    A researcher tests word list recall in a soundproof cubicle. Suggest one reason participants might not behave as they usually would.

    Model answer

    They may work out the purpose of the study and adjust their effort to fit what they think the researcher expects, showing demand characteristics.

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Research Methods and Techniques
Planning and Conducting Research
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APunishment requires deprivation, loss of autonomy and stigma.
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