A medical researcher randomly assigns 200 volunteers with mild hypertension to receive either a new drug or a placebo. After 8 weeks, blood pressure is measured for each participant.
This study is best described as
- A
An observational study
- B
A matched-pairs study
- C
A stratified survey
- Dcheck_circle
A completely randomized experiment
Explanation
The researcher imposes treatments (drug or placebo) using random assignment to two groups with no blocking. This is a completely randomized experiment.