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 neither Abdul nor the experimenters know whether the pills he takes contain aspirin or are merely placebos, which helps to eliminate experimenter bias and increase the validity of the results.

Abdul Has Volunteered to Participate in an Experiment Evaluating the Effectiveness