Abdul has volunteered to participate in an experiment evaluating the effectiveness of aspirin. Neither he nor the experimenters know whether the pills he takes during the experiment contain aspirin or are merely placebos. The investigators are apparently making use of

Question

Quizplus · Accepted Answer

The double-blind procedure is being used because both Abdul and the experimenters do not know whether the pills are aspirin or placebos. This is done to eliminate bias and ensure that the results of the experiment are accurate. Naturalistic observation is not relevant to this experiment, and the testing effect and random sampling are not related to the use of placebos or double-blind procedures.

Abdul Has Volunteered to Participate in an Experiment Evaluating the Effectiveness