People who participate in an experiment, whose reactions or responses are observed as part of the experiment, usually to test the validity of a hypothesis, are called ________.
A) stooges
B) partners
C) participants
D) confederates

Question

Quizplus · Accepted Answer

The word "participants" perfectly fits the given description of individuals who are part of an experiment and whose reactions or responses are observed to test a hypothesis. The other options like "stooges" or "confederates" might refer to individuals who deliberately deceive the experimenters for some specific purposes, but this term may not fit all experimental contexts. Therefore, option C is the best fit for the given scenario.

People Who Participate in an Experiment, Whose Reactions or Responses