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Planning and Conducting Research

Variables, operationalisation and control of extraneous variables

  • 3 things to know
  • Component 01

Overview

Recall questions on independent and dependent variables, operationalisation, control conditions, extraneous and confounding variables, investigator effects, standardised instructions and procedures, single-blind and double-blind procedures, and spotting uncontrolled variables in example studies.

What you need to know

Answer each one before you reveal it.

Your recallNot started
Key term

What is the dependent variable?

Study

What is a control condition and why is one used?

Key term

What is the independent variable?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is the independent variable?

    Model answer

    The variable that the researcher manipulates, or that varies naturally, in order to see its effect on the dependent variable.

  2. 2

    What is the dependent variable?

    Model answer

    The variable that is measured in order to see whether the independent variable has had an effect.

  3. 3

    What does it mean to operationalise a variable?

    Model answer

    To define it in precise terms that state exactly how it will be manipulated or measured.

  4. 4

    Suggest an operationalised measure of aggression for an observation of children at play.

    Model answer

    The number of physical acts such as hitting, kicking or pushing recorded during a ten-minute period.

  5. 5

    Suggest an operationalised measure of memory for a laboratory study.

    Model answer

    The number of words correctly recalled from a list of twenty after a delay of two minutes.

  6. 6

    Why must variables be operationalised?

    Model answer

    So that the study can be replicated and other researchers know precisely what was manipulated and what was measured.

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