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What is the difference between a between-groups and a within-subjects design?

A between-groups design is an experimental design in which different groups are assigned to the different conditions in the experiment. That is, the individuals who comprise a control group will be different people from those in an experimental group. The point of the study then is to examine any observed differences between the groups.

A within-subjects design is one in which the same individuals participate in all of the experimental conditions – that is, repeated measures are taken from the same people, hence differences are examined within the subjects.




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