When Does a Placebo Effect Occur

question 100

Multiple Choice

When does a placebo effect occur?

• A)When an experimenter finds what he or she expected to discover.
• B)When participants have not been randomly assigned to experimental and control conditions.
• C)When participants change their behaviour because of their belief that a treatment has had an effect.
• D)When both participants and experimental assistants are unaware of which participants get which treatment.