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Determine if the following scenario is an observational study or a controlled experiment. A doctor is...

Determine if the following scenario is an observational study or a controlled experiment.

A doctor is interested in determining whether a certain medication increases the risk of high bloodpressure. He reviews his patients' medical records and finds that a higher proportion of people who take the medication are suffering from high blood pressure.

A)Neither

B) Observational study

C) Controlled experiment

math   Statistics-And-Probability   
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Answer #1

In obsevational study, researchers only observe cause and effects of surveyed data. They don't have control over the data or study. They can not decide how many groups must be there or how many treatments must be there. Whereas in controlled experiment researcher can do all that things. They can decide the number of groups / treatements.

Here doctor reviews his patients' medical records. He is not assigned any medicine to a group of patients. Hence he don't have any control over which people should have to take which medicine. He is just observing a history .

Hence we call this as Observational study.

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