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4. 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. Neither doctors nor patients were told who received the drug. The number of episodes of pain reported by each subject was recorded. This is an example of: a. an observational study. b. an experiment, but not a double-blind experiment. c. a double-blind experiment. d. a matched pairs experiment.

4. 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. Neither doctors nor patients were told who received the drug. The number of episodes of pain reported by each subject was recorded. This is an example of: a. an observational study. b. an experiment, but not a double-blind experiment. c. a double-blind experiment. d. a matched pairs experiment.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.6: Summarizing Categorical Data
Problem 27PPS
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4. 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. Neither doctors nor patients were told who received the drug. The number of episodes of pain reported by each subject was recorded. This is an example of: a. an observational study. b. an experiment, but not a double-blind experiment. a double-blind experiment. d. a matched pairs experiment. c.
Transcribed Image Text:4. 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. Neither doctors nor patients were told who received the drug. The number of episodes of pain reported by each subject was recorded. This is an example of: a. an observational study. b. an experiment, but not a double-blind experiment. a double-blind experiment. d. a matched pairs experiment. c.
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