While both single-blind and double-blind procedures both prevent a study participant from knowing what a test drug is,single-blind procedures differ from double-blind procedures by:
A) not allowing investigators to know which drug participants received.
B) allowing study participants to later choose which drug.
C) allowing participants in other groups to know which drug they received.
D) allowing investigators to know which drug participants received.

Question

Quizplus · Accepted Answer

Single-blind procedures only prevent study participants from knowing what the test drug is, while double-blind procedures prevent both participants and investigators from knowing which drug is being tested. Therefore, choice D is the best answer as it correctly distinguishes between the two procedures.

While Both Single-Blind and Double-Blind Procedures Both Prevent a Study