Psychology- Experimental design

  • Created by: Daisymac
  • Created on: 18-01-19 17:06
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  • Experimental design
    • What?
      • The different ways in which the testing of participants can be organised in relation to the experimental conditions
    • Independent group design
      • Participants are allocated to different groups where each group represents one condition
      • Participants can be randomly allocated to to each condition
      • Strengths-      P Lack of order effects .E haven't practiced or become bored .           E increases internal validity
      • Limitations-      P lots of participant variables .       E as conditions contain different people .          E decreases external validity
    • Repeated measure
      • Using the same participants in each condition of the experiment so every participants experience both conditions
      • Strength-         P no participant variable .         E same participants doing same conditions       E increases external validity
      • Limitations-      P order effects .           E as repeating two tasks could create boredom or fatigue which might cause deterioration in the second task .               E decrease internal validity
    • Matched pairs
      • Using different, but similar participants in each condition so that an effort is made to match the participants in each condition based on variables like gender,age
      • Strength-         P lack of order effects    E taking part in one condition .      E increases internal validity
      • Limitation-       P cant be matched perfectly .       E time consuming      E decrease internal validity
    • Random allocation
      • An attempt to control for participant variables in an independent group design which ensures that each participant has equal chance of being selected
    • Counterbalancing
      • An attempt to control for the effects of order in a repeated measure design where half the participants experience the conditions in one order and the other in another order

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