Experimental design

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  • Experimental Designs
    • Repeated measures design
      • Each ppt takes part in every condition under test.
      • +Good control for ppt variables
        • +Fewer ppts needed.
      • -Order effects, may perform better or worse on each test
        • -Ppts may guess purpose of experiment.
        • -Condition A may be easier than condition B.
    • Independent measures design
      • Ppts allocated to two (or more) experimental groups representing different levels of IV.
      • +Avoids order effects, ppt only tested once.
        • +Avoids ppt guessing aim of experiment.
      • -No control of ppt variables
        • -Needs more ppts
    • Matched participant design
      • Ppts who are similar on key variables are paired.
      • +Controls for ppt variables because of matching.
        • +Avoids order effects, like an independent measures design
      • -Very time consuming, matching ppts
        • -May not control all ppt variables.


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