Between-subjects is a type of experimental design in which the subjects of an experiment are assigned to different conditions, with each subject experiencing only one of the experimental conditions. This is a common design used in psychology and other social science fields. At its most basic level, this design requires a treatment condition and a control condition, with subjects randomly assigned to one of the two conditions. An experiment with three treatment conditions would have three groups of subjects, with each group receiving one of the three treatment conditions, and so on. This is in contrast to a within-subjects design in which each subject experiences multiple conditions of a variable being tested. The term between-subjects indicates that the differences in the conditions happen between the ...
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