Psychology-Control of variables

  • Created by: Daisymac
  • Created on: 18-01-19 17:06
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  • Control of variables
    • Extraneous variables
      • Any variable, other than the Iv, that may have an affect on the dv if not controlled
      • Do not vary systematically with the IV
      • Eg. Situational variables
    • Confounding variables
      • Any variable, other than the IV, that may have affected the DV, so we cannot be sure of the true source of the changes to the DV
      • Varies systematically with the IV
      • Eg. Participant variables
    • Demand characteristics
      • Any cue from the researcher or the research situation that could be interpreted by the participants as revealing the aim of the investigation, and so leading to the changing their behaviour
      • Participant reactivity- Hawthorne effect
      • Please-u-effect or screw-u-effect
    • Investigator effects
      • Any effect of the researcher's  behaviour on the research that may have an effecet on the research outcome
      • Eg.leading questions
    • Randomisation
      • Use of chance in order to control for the effects of bias when designing materials and deciding the order of conditions
      • Eg. the order of lists should be randomly generated
    • Standardisation
      • Using exactly the same formalised procedures ad instructions for all participants in a research study

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