Variables

• Independent Variable

  something the researcher uses to create different conditions for comparison in order to investigate a hypothesis
• Dependant Variable

  What is measured in an experiment. Should be operationalised (have specific units)
• Extraneous variable

  Something that is not the Independent variable but which affects the dependent variable. Must be carefully controlled. Only affects one person.
• Confounding variable

  Something that is not the Independent variable but which affects the dependent variable. Must be carefully controlled. Effects all participants