Indicate whether the study described is an observational study or a controlled experiment.
-A group of cancer patients is divided into two groups. One group is given a new drug to fight the side effects of chemotherapy and the other group is given a placebo. After three months they are asked to respond to a questionnaire about the frequency and severity of their side effects to see whether the new drug improved the overall negative side effects of chemotherapy.
A) Controlled experiment
B) Observational study

Question

Quizplus · Accepted Answer

This is a controlled experiment because the researchers actively assign participants to receive either the new drug or a placebo to compare the effects, allowing them to establish a cause-and-effect relationship.

Indicate Whether the Study Described Is an Observational Study or a Controlled