Researchers post flyers in a college and recruit 80 student volunteers, randomly assigning 40 to a new study technique and 40 to traditional methods. The new technique produces higher scores.
Which inference is justified?
- Acheck_circle
Cause-and-effect for these volunteers, but no broad generalization
- B
Generalization to all college students but no causation
- C
Neither causation nor generalization
- D
Cause-and-effect for all college students
Explanation
Random assignment supports causal inference for the studied subjects. No random sampling means we should not generalize beyond the volunteers.