A Psychologist Recently Said That, "For Relatively Mild Medical Problems

Multiple Choice

A psychologist recently said that, "For relatively mild medical problems, the placebo effect will produce positive results in roughly two-thirds of patients." The placebo effect is

A) the bias due to voluntary response in a sample.
B) the effect of a dummy treatment on a patient.
C) a violation of comparative experimentation.
D) the effect of confounding in an observational study.