posted by Indigo .
Which of the following statements about psychological experiments is MOST accurate?
A. The purpose of a single-blind experiment is to guarantee that neither the participants nor the experimenter influence the results.
B.The participant's expectations about an experiment do not influence results.
C.The placebo effect describes a change in a patient's illness or physical state that results solely from the medication administered.
D.Both the experimenter's expectations and the participant's expectations can influence the results of an experiment.
I'll be glad to check your answer.