Question

to determine if a drug has an effect on patient illness, a researcher gives the drug to 100 patients and gives a placebo to another group of 100 patients.
what type of study is this?
options:
experiment
observational study
census
sample survey
simulation

Explanation:

This study involves actively assigning different treatments (the drug vs. a placebo) to two groups of patients to test the drug's effect, which is the defining feature of this study type.

Answer:

experiment