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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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Histrionicus

Answer:

The correct answer is - an observational study.

Step-by-step explanation:

It is given that, Researchers periodically survey a few thousand of the patients. These are taking specific medicine patients and researchers taking this survey to find the connection between that medication and the subjects' general health.

So, it can say that the researchers observed the patient's health by the effect of the medication, therefore, the Observational Study is the given method of gathering data.

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