a Is the aspirin produced by a particular pharmaceutical com

a) Is the aspirin produced by a particular pharmaceutical company better than that of a competitor at relieving headaches? Which of the following would best be used to study this: 1) a case-controlled observation; 2) an observation; 3) a double-blind experimental procedure; and 4) and experimental procedure.

Solution

3) a double-blind experimental is the best choice. We can take subjects who heave headache (with their permission) and split them into two groups, treat one group with one pharmaceutical and the other group with competitor\'s medicine. If (subjectively) it is not permissible to find subjects with headache willing to try an unknown drug (blind experiment), we will use observational study.