Question: Rats with cancer are divided into two groups. One group receives 5 milligrams of a medication that is thought to fight cancer, and the other

Rats with cancer are divided into two groups. One group receives 5 milligrams of a medication that is thought to fight cancer, and the other received 10 milligrams. After 2 years the spread of the cancer is measured. Determine whether the study depicts an observational study or an experiment.

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