experimental designs in psychology

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  • experimental designs
    • REPEATED MEASURES DESIGN         -each participant takes part in every condition under test.
      • less participants needed
      • good control of participant variables e.g. willingness of participant
      • order effect produced e.g. out of boredom or practice on task beforehand.
      • research aim becomes obvious because participant does every task
      • some conditions may be easier than others
      • OVERCOME WEAKNESS OF ORDER EFFECT by counterbalancing.this is where each experimental condition is presented in first or last in equal measure by giving half of the participants one condition and the other half the other condition
    • INDEPENDENT MEASURES DESIGN - participants are allocated to two or more experimental groups which represent two different levels of the IV.
      • avoids order effect because each participant is only tested once.
      • avoids participants guessing the research aim
      • no control of participant variables
      • needs lots of participants
      • OVERCOME WEAKNESS OF PARTICIPANT VARIABLE CONTROL by randomly allocating the participants to conditions
    • MATCHED PARTICIPANTS DESIGN - participants who have similar abilities are paired together, so there are 2 groups of participants, each group is on one level of IV
      • the matching acts as a control
      • time consuming in matching participant's abilities
      • avoid order effect because it is like independent measures design
      • may not control all participant variables because you can only match on variables that are relevant but other variables may be relevant
      • OVERCOME WEAKNESS OF PARTICIPANT VARIABLES by using a large sample to match key variables between participants


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