Which of the following represents a blind study?
A. The test group does not know whether they are receiving a placebo or the actual treatment, but the researchers do.
B. Neither the test group nor the researchers know whether the test group is receiving a placebo or the actual treatment until all the data are collected.
C. The test group knows whether they are receiving a placebo or the actual treatment, but the researchers do not know until all the data are collected.
D. The test group knows whether they are receiving a placebo or the actual treatment, and so do the researchers.
Answer: A
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Figure 24.9
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