Sickle-cell disease is a painful disorder of the red blood cells. To investigate whether drug A can reduce the pain associated with sickle-cell disease, a study by the National Institutes of Health randomly assigned 150 sickle-cell sufferers to receive the drug. Placebos were given to another 150 sickle-cell sufferers. Great care was used to ensure that the 300 participants did not know if their pill contained the drug. At the end of the treatment period, the researchers counted the number of episodes of pain reported by each subject.
-What type of study is this?

Question

Quizplus · Accepted Answer

This is a randomized experiment because the participants were randomly assigned to receive the drug or a placebo.

Sickle-Cell Disease Is a Painful Disorder of the Red Blood