A double-blind study is one in which neither the researchers nor the subjects know who is receiving the real treatment and who is receiving the placebo. Why are studies designed in this way? A.
Knowing which subjects are receiving the placebo would allow the researchers to interpret the results too quickly.
B.
The subjects receiving the placebo would become frustrated if they knew the truth.
C.
The researchers might not bother providing the placebo.
D.
Knowing which subjects are receiving the placebo could introduce bias into the study.