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.

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Definitions:

Ventilator-Associated Pneumonia

A type of lung infection that occurs in people who are on mechanical ventilation breathing machines in hospitals.

Chlorhexidine

An antiseptic used to clean the skin or mouth, preventing infections.

Chest Tube

A medical device inserted through the chest wall to remove air, fluid, or pus from the pleural space, helping the lungs to expand properly.

Water-Seal Chamber

A component of a chest tube drainage system that prevents air from re-entering the patient’s pleural space and allows trapped air and fluid to escape from the chest.