A drug company recruits 300 volunteers through online ads and randomly assigns 150 to a new migraine drug and 150 to a placebo. The drug group reports significantly fewer migraines.
Which conclusion is most appropriate?
- A
Random assignment alone allows generalization
- B
We cannot conclude causation due to lack of random sampling
- Ccheck_circle
The drug reduces migraines for these volunteers; we cannot generalize broadly
- D
The drug reduces migraines for all migraine sufferers
Explanation
Random assignment allows causal inference for the subjects in the study. Volunteers are not a random sample, so generalization to the broader population is not justified by the design.