Problem:
A medical experiment compares an antidepressant medicine with a placebo for relief of chronic headaches. There are 36 headache patients available to serve as subjects. To choose 18 patients to receive the medicine, you would
(a) assign labels 01 to 36 and use Table B or a random number generator to choose 18.
(b) assign labels 01 to 18, because only 18 need to be chosen.
(c) assign the first 18 who signed up to get the medicine.