The difference between an observational study and an experiment is that.
A in an experiment, cause-and-effect is analyzed, and in an observational study, it is not.
B in an experiment, one group is studied over a short period of time, and in an observational study, the group is studied over a longer period of time.
C in an observational study, only one group is studied, and in an experiment, two groups are studied.
D in an observational study, the researchers do not control treatment, and in an experiment, they do.
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