Psychology- Types of experiment

  • Created by: Daisymac
  • Created on: 16-01-19 17:20
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  • Types of experiment
    • Lab experiments
      • Conducted in a highly controlled environment in which the researcher manipulates the IV and records the effect on the DV
      • Strengths-        P High control over extraneous variables         E means the researcher can ensure any effect on DV is because of the IV .            E high internal validity
      • P may lack generalisability                      E lab environment may be quite artificial and not like every day life .          E low external validity
    • Field experiments
      • An experiment where by the change in the IV is not brought about by the researcher but would have happened even if the researcher had not been there
      • Strengths-       P have high mundane realism .          E because environment is more natural and so produce natural behaviour .      E high external validity
      • Weaknesses-   P Loss of control of extraneous variables.        E the cause and effect between iv and dv are more difficult to establish .   E lack external validity
    • Natural experiments
      • An experiment where the change in the iv is not brought about by the researcher but would have happened even if the researcher was not here
      • Strengths-        P provide opportunities for research that may not otherwise have been ethical .           E High external validity
      • Limitations-       P naturally occurring event may only happen rarely .            E may limit the scope for generalising to other situations
    • Quasi experiments
      • A study that is almost an experiment but lacks key ingredients. The iv has not been determined by anyone and variables simply exist
      • Strengths-same as lab experiments
      • Weaknesses- Cannot randomly allocate participants to conditions and therefore there may be confounding variables

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