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A(n) __________ refers to a substance or treatment that is often used in an experiment but does not have an actual medicinal or experimental benefit.
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A(n) __________ refers to a substance or treatment that is often used in an experiment but does not have an actual medicinal or experimental benefit.

User Monim
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Placebo
EXPLANATION
In a psychology experiment, a placebo is an inert treatment or substance that has no known effects.
User Abril
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Answer:

placebo

Step-by-step explanation:

User Neil Twist
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