Experimental methods

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  • Created by: Georgina
  • Created on: 14-04-14 12:34
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  • Experimental methods
    • True Experiment
      • Investigator manipulate independent variable to investigate a change in dependent variable
      • All other variables are controlled or eliminated
      • Ppts are allocated to experiment randomly
      • Quasi
        • Seems like a true exp. but doesn't tick all the boxes
    • Hypothesis
      • alternative
        • Directional
        • Non-directional
      • Null
    • Confounding variables
      • Unwanted variables
      • Individual differences
      • non-standardised procedure
    • Advantages
      • Establish cause and effect relationships
      • Produces quantative data that can be tested by statistical tests whhich show if results are caused by chance
      • Able to generalize findings
    • Disadvantages
      • Some experiments are unethical to carry out
      • demand characteristics
      • low population valididty
    • Laboratory experiment
      • Controlled all variables
      • + Replicability
      • +control over variables
      • Sophisticated measuring equip.
      • artificial
      • loss of ecological validity
      • Demand characteristics
    • Field experiment
      • natural environment
      • manipulates Iv
      • improved ecological validity
      • reduction of demand characterisitics
      • weak at establishing cntrolls
      • weak at generalizng to other situations
    • Natural experiment
      • naturally occuring variables
      • reductions of demand caracteristivs
      • Lack of direct intervention
      • Loss of controll
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