Participants volunteered to be in a study of the effects of vitamin supplements. The experimenter was given an unlabeled syringe containing saline or a vitamin supplement to inject into the participant. The participants were not told if the injection they received is the vitamin supplement or a placebo. This experiment is using an) ______technique.
A) deception
B) double-blind
C) blind
D) independent measure of the dependent variable

Question

Quizplus · Accepted Answer

This experiment is using a double-blind technique because neither the participants nor the experimenter knows who is receiving the vitamin supplement and who is receiving the placebo, preventing bias.

Participants Volunteered to Be in a Study of the Effects