Experimental design

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  • Created by: z_mills1
  • Created on: 12-05-14 19:28
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  • Experimental design
    • Repeated measures
      • same participants are used in both conditions
      • Advantages
        • individual differences should no longer affect the results as same people in both conditions
        • fewer participants are needed to get the same amount of data
      • Disadvantages
        • order effects may occur with participants doing both conditions
        • range of use is smaller
    • Independent groups
      • participants are randomly allocated to different groups which represent the different conditions
      • Advantages
        • no order effects - no one gets better through practice or gets worse through fatigue
        • demand characteristics less likely to occur - pp's will be unaware of other condition
      • Disadvantages
        • individual differences between people in each group may affect the results
        • twice as many participants are needed to get the same amount of data, compared to everyone doing both conditions
    • Matched pairs
      • pairs of participants are closely matched then randomly allocated to one condition
      • Advantages
        • no order effects - different people in each condition
        • individual differences are minimised through close matching
      • Disadvantages
        • need twice as many people compared to repeated measures
        • time-consuming and difficult to find participants that match


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