If the experimenter knows which treatments the participants have been administered, but the participants do not, the study is called:

Question

Quizplus · Accepted Answer

This study is considered blind because the participants do not know which treatment they have been given, but the experimenter does know. A double blind study would involve neither the participants nor the experimenter knowing which treatment has been given, so that would not be the correct answer. Placebo and invalid are not accurate choices for this scenario.

If the Experimenter Knows Which Treatments the Participants Have Been