Which of the Following Represents a Double-Blind Study

question 22

Multiple Choice

Which of the following represents a double-blind study?

• A)The test group knows whether they are receiving a placebo or the actual treatment, and so do the researchers.
• B)The test group does not know whether they are receiving a placebo or the actual treatment, but the researchers do.
• 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)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.