Researchers plan to investigate a new medication that may reduce blood pressure for individuals with higher than average blood pressure. 90 volunteers with higher than average blood pressure are solicited.Volunteers are randomly assigned 100 mg of the medicine, 200 mg of the medicine, or a placebo. Blood pressure will be measured at the beginning and at the conclusion of the study. (8 points)

a. Identify the experimental units. 90 volunteers

b. Identify the treatments.

c. Identify the response variable.

d. Describe the advantage of the placebo.