Mathematics, 16.07.2021 16:30 krystinayagel013

V\Researchers periodically survey a few thousand of the patients taking a certain medication in order to make connections between that medication and the subjects’ general health. This method of gathering data is classified as a census.
a sample survey.
an experiment.
an observational study.

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V\Researchers periodically survey a few thousand of the patients taking a certain medication in orde...