Experimental Methods

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  • Experimental Methods
    • Laboratory Experiment
      • Def. Conducted in an artificial environment in attempt to control all variables except IV
      • Advantages
        • High levels of control
        • Possible to establish casual relationships between variables
      • Disadvantages
        • Artificial so may lack ecological validity
        • Pps behaviour can alter to what it would be like in real life as they know they're being studied
          • Demand characteristics
    • Field Experiment
      • Def. Behaviour studied in natural environment but IV still manipulated and DV measured
      • Advantages
        • Natural environment gives it ecological validity
        • Demand characteristics avoided as Pps don't know they're being studied
      • Disadvantages
        • Lack of control means extraneous variables can effect the results
        • Ethical issues can be raised as Pps have not consented
    • Quasi/natural Experiment
      • Def. The IV is not manipulated by researcher but occurs naturally
        • Gender, Age, Law
      • Advantages
        • Only way to study relationships that would be unethical to manipulate
          • Can't make someone a criminal to test the effect it had
      • Disadvantages
        • No control over extraneous variables


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