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Observational Study vs. Experiment

APSTAT-YNHPWJ

What is the main difference between an observational study and an experiment?

A

An experiment is more likely to involve a random sample of individuals while an observational study is more likely to involve volunteers.

B

In an experiment, some type of treatment is imposed upon subjects, while in an observational study no treatments are imposed.

C

An observational study never looks for an association between two variables, while an experiment is seeking to find an association between two variables.

D

Data obtained from an observational study will usually have less bias than data obtained through a well-designed experiment.

E

There is no difference. An observational study is a specific type of experiment.