Headaches compared Doctors identify “chronic tensiontype headaches” as headaches that occur almost daily for at least six months. Can antidepressant medications or stress-management training reduce the number and severity of these headaches? Are both together more effective than either alone? Researchers want to compare four treatments: antidepressant alone, placebo alone, antidepressant plus stress management, and placebo plus stress management. Describe how you would randomly assign 36 volunteer subjects to the treatments using (a)

identical slips of paper and

(b) a random number generator.