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What is the main difference between an observational study and an experiment?
An experiment is more likely to involve a random sample of individuals while an observational study is more likely to involve volunteers.
In an experiment, some type of treatment is imposed upon subjects, while in an observational study no treatments are imposed.
An observational study never looks for an association between two variables, while an experiment is seeking to find an association between two variables.
Data obtained from an observational study will usually have less bias than data obtained through a well-designed experiment.
There is no difference. An observational study is a specific type of experiment.