Between-Subjects Variable

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Between-subject variables are independent variables or factors in which a different group of subjects is used for each level of the variable. If an experiment is conducted comparing four methods of teaching vocabulary and if a different group of subjects is used for each of the four teaching methods, then teaching method is a between-subjects variable. If every variable in an experimental design is a between- subjects variable, then the design is called a between-subjects design. Some experimental designs have both between- and within-subjects variables.