Phil Is a Participant in a Study Designed to Examine

Multiple Choice

Phil is a participant in a study designed to examine the effects of taking a dietary supplement on muscle tissue development.Phil suspects he is in the experimental group,because he is certain his muscles are bigger and stronger as a result of taking the product supplied by the researchers.When the study is completed,Phil learns that he did not receive the dietary supplement.Phil thinks the researchers made a mistake-he is certain his muscle mass increased while he took the supplement.According to this information,Phil's belief that his physical condition improved while he participated in the study is an example of ________.

A) an anecdotal report
B) participant fatigue
C) human subject bias
D) the placebo effect