Sickle-cell disease is a painful disorder of the red blood cells that in the United States affects mostly African Americans.To investigate whether the drug hydroxyurea can reduce the pain associated with sickle-cell disease,a study by the National Institutes of Health gave the drug to 150 sickle-cell sufferers and a placebo to another 150 sufferers.The researchers then counted the number of episodes of pain reported by each subject.What is the response variable in this study?

Question

Quizplus · Accepted Answer

The response variable in this study is the number of episodes of pain reported by each subject. This is the variable being measured to determine the effectiveness of the drug hydroxyurea in reducing pain associated with sickle-cell disease. The other options (A, C, and D) are not response variables, as they are either treatments (drug hydroxyurea), conditions (presence of sickle-cell disease), or unrelated variables (number of red blood cells) to the main objective of the study.

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