Research issues

• What are Extraneous Variables?

  Any variable, other than the IV, that may effect the DV if it is not controlled. EVs do not vary systematically with the IV.
• What are Confounding variables?

  Variables other than the IV that vary systematically with the IV. This means that we cannot tell whether a change to the DV is due to the IV or the confounding variable.
• What are the three types of Extraneous Variables?

  • Participant variables
  • Situational variables
  • Experimenter variables
• What are Participant Variables?

  Any individual differences between participants that may affect the DV.
• What are Situational variables?

  Any features of the experimental situation that may affect the DV.
• What are Experimenter variables ?

  Concern changes in personality, appearance and conduct of the Experimenter.