Between-subjects (or between-groups) study design is required when the experimenter wants to compare several user interfaces (or treatments) in a single study. In such a design, each person is only exposed to a single user interface (or treatments) and the goal is to see if one treatment is better than the other
For example, consider a study on comparing the effect of 2 teaching methods on a group of students. The purpose is to compare the performance of the teaching methods. In a between-subjects design, students are separated into two groups and each group is taught by different methods. Finally a test is conducted and scores are recorded for each group, which can be analysesd to identify the effective teaching method.
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