Difference between causal comparative and experimental research design

 Causal comparative and experimental research both attempt to establish cause effect relationship and both involve comparison. But there are difference between two methods.

In experimental design researcher select a random sample and then randomly divide the sample into two or more groups. Groups are assigned to the treatment and the study is carried out.

In causal comparative design individuals are not randomly assigned to treatment groups because they already were assigned into groups before the research began.

In experimental research the independent variable is manipulated by the researcher whereas in causal comparative research the groups are already firmed and already different on the independent variable. Independent variable in causal comparative cannot be manipulated by the researcher.

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