Dr Kiel Is Designing a Study to Test the Effectiveness

Multiple Choice

Dr. Kiel is designing a study to test the effectiveness of a new anxiety medication. The study includes a placebo control group and neither the participants nor the research assistants who give out the medications know whether a participant is receiving the actual drug or a placebo. This study is a good example of

A) the placebo procedure
B) operational definitions
C) random sampling
D) the double-blind procedure