An experimenter bias effect operates when an experimenter
A) deliberately manipulates subjects' behavior or falsifies data in order to obtain an"expected" finding.
B) inadvertently transmits his/her expectancies about the outcome of an experiment in a way that affects subjects' behavior.
C) deliberately selects a sample that he/she knows will perform in the "expected" way.
D) All of these are true.

Question

Quizplus · Accepted Answer

Experimenter bias occurs when an experimenter unconsciously communicates their expectations to the participants, which then influences the participants' behavior. This may occur simply through nonverbal cues or tone of voice, which can affect things such as confidence level, mood, or reaction times. Experimenter bias does not involve deliberate manipulation, falsification, or selection of data.

An Experimenter Bias Effect Operates When an Experimenter