Experimental Design

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  • Experimental Design
    • Repeated Measures Design
      • each participant takes part in every level of the IV
      • Evaluation: fewer pps required, eliminates participant variables, the order of the conditions may affect performance(order effect), or some may do worse on the second test because of boredom(boredom effect), by doing it twice, pps may guess true aims of study(demand characteristics)
      • Methods of dealing with limitations: counterbalancing- AB or BA, ABBA
    • Independent Group Design
      • pps are placed in separate grounds, each group does on level of the IV
      • Evaluation: no order effects, less demand characteristics, participants variables are a problem, needs more pps compared to a repeated measures
      • Methods of dealing w/ limitations: random allocation, lottery method.
    • Matched Pairs Design
      • pairs of pps are matched in terms of key/relevant variables e.g age, gender and IQ
      • Evaluation: no order effects, participant variables are kept constant between conditions, very time consuming and difficult to match pps on key variables, not all participant variables can be controlled.
      • Methods of dealing w/ limitations: restrict the number of variables to match, conduct a pilot study to consider key variables that may be important when matching.


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