Joe conducts an experiment to test the effectiveness of a new drug for cancer. Which of the following variables would be easiest to control?
A. amount of drug administered
B. patient’s diet
C. exposure to air pollution
D. exposure to other people
Answer:A
Joe conducts an experiment to test the effectiveness of a new drug for cancer. Which of the following variables would be easiest to control?
A. amount of drug administered B. patient’s diet C. exposure to air pollution D. exposure to other people