An experiment in which neither the experimenter nor the participants knows which treatment has been administrated to the participant is called:

Question

Quizplus · Accepted Answer

A double blind experiment is designed to reduce bias by keeping both the experimenter and the participants unaware of which treatment is being administered. The use of placebos may also be incorporated into the study design. Choice A (blind) implies that only the participant or the experimenter is unaware, which does not fully eliminate bias. Choice C (placebo) is a tool used in double blind experiments but does not describe the overall study design. Choice D (invalid) does not provide enough information about the study design to accurately assess its validity.

An Experiment in Which Neither the Experimenter nor the Participants