types of experimental designs

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  • types of experiments (experimental design)
    • lab
      • carried out in well controlled environments
        • researcher manipulates IV and randomly allocates pp to conditions
      • advantages
        • easy replication
        • control extraneous variables
        • can be checked for reliability
        • cause and effect can be assumed as IV been manipulated to see effect on DV
      • disadvantages
        • low ecological validity
          • cannot generalise to RL
          • artificial settings affect pp behaviour
            • demand characteristics
    • field
      • experiments carried out in more natural setting but IV still manipulated by experimenter
      • advantages
        • high ecological validity
          • more natural environment
            • less likely to get demand characteristics as don't know being studied
      • disadvantages
        • difficult to replicate
        • difficult to control extraneous variables as more natural setting
        • could break ethical issues of informed consent and deception
    • natural
      • still an IV and DV but experimenter takes advantage of natural changes occurring
      • advantages
        • High ecological validity as real life occurrences
        • can be used when other research is unethical
      • disadvantages
        • can't fully control what's being tested as IV is difficult to control
        • difficult to replicate
    • quasi
      • has an IV but not free to be manipulated by experimenter
      • advantages
        • less articial  than lab so more likely to generalise to RL
      • disadvantages
        • random allocation of pp not possible= confounding variables affect results
        • hard to establish cause and effect


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