Why Are Placebos Used in Experiments

question 1

Multiple Choice

Why are placebos used in experiments?

• A)to control for the expectations of some research participants that they will improve just because they are in a research study
• B)to make certain that the treatment and control groups receive the same number of subjects
• C)to make certain that the treatment and control groups receive the same treatment
• D)to control for the variability of individuals who tend to volunteer for research studies

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Definitions:

Test Statistic

A value calculated from sample data during a hypothesis test that is used to make a decision about the validity of a hypothesis.

Type I Error

The mistake of rejecting a true null hypothesis, also known as a false positive.

Level of Significance

The threshold under which the null hypothesis is rejected in hypothesis testing, usually denoted by alpha.

Critical Value

A threshold or point on the test distribution that defines the boundary or limit for rejecting the null hypothesis in hypothesis testing.