There are three ways to design an experiment, and the design we choose can have a major impact on the validity of our research.
Independent Groups design – every participant experiences only one level (or condition) of the IV, allowing comparison between the results from different groups.
Repeated Measures design – every participant experiences every level (or condition) of the IV, allowing comparison between each participants scores in each condition.
Matched Pairs design - every participant experiences only one level (or condition) of the IV, allowing comparison between the results from different groups. HOWEVER – participants in one condition are carefully ‘matched’ (i.e. same age, gender, socio-economic group etc) with participants in the other in order to reduce individual differences.
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