Determine if the following scenario is an observational study or a controlled experiment. A doctor is interested in determining whether a certain medication reduces migraines. She reviews her patients' medical records and finds that a higher proportion of people who take the medication have fewer migraines than those who did not take the medication.
A)Observational study
B)Controlled experiment
C)Neither

Question

Quizplus · Accepted Answer

This scenario is an observational study because the doctor is reviewing existing data and not manipulating any variables or assigning treatments to subjects.

Determine If the Following Scenario Is an Observational Study or a Controlled