The control group design
In a study utilizing the control group design the researcher selects two population groups a control group and an experimental group.These groups are expected to be comparable as far as possible in every part. The experimental group either receives or is exposed to the intervention, whereas the control group is not.
Firstly, the ‘before’ observations are made on both groups at the same time. The experimental group is then exposed to the intervention. When it is assumed that the intervention has had an impact, an ‘after’ observation is made on both groups. Any difference in the ‘before’ and ‘after’ observations between the groups regarding the dependent variable(s) is attributed to the intervention.
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