A designed experiment in the medical field involving human subjects is referred to as a clinical trial. One recent clinical trial was designed to determine the potential of using aspirin in preventing heart attacks. Volunteer physicians were randomly divided into two groups—the treatment group and the control group. Each physician in the treatment group took one aspirin tablet a day for one year, while the physicians in the control group took an aspirin-free placebo made to look identical to an aspirin tablet. Because the physicians did not know which group, treatment or control, they were assigned to, the clinical trial is called a blind study. Assume 20 physicians volunteered for the study. Use a random number generator to randomly assign half of the physicians to the treatment group and half to the control group.