Mathematics, 08.04.2020 20:27 Weser17

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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