Which of the Following Statements Describes a Double-Blind Experiment

question 19

Multiple Choice

Which of the following statements describes a double-blind experiment? 

• A) The experimental and control groups take turns getting each treatment. 
• B) Neither subjects nor researchers know which subjects are in the control or experimental groups. 
• C) Neither group of subjects knows whether they are in the control or experimental group, but the researchers do know. 
• D) Both subject groups know whether they are in the control or experimental group, but the researchers do not know. 
• E) Neither the subjects nor the persons having contact with the subjects know the true purpose of the experiment.