A psychologist is doing research for a pharmaceutical company. The drugs he is testing are numbered so that he does not know what they are, nor does he know which participants are receiving which drugs. Participants are also unaware of differences in treatments. The control that is being used in this study is called a

Question

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This is a double-blind control, where neither the participants nor the researchers know who is receiving the actual treatment and who is receiving a placebo, eliminating bias from both sides.  In this case, bias can be eliminated to the fullest extent possible by not allowing the experimenter or the participants to know who is receiving which treatment.

A Psychologist Is Doing Research for a Pharmaceutical Company