Imagine that a group of researchers designed a study to test the effectiveness of subliminal-message weight-loss tapes.Half the participants receive real tapes,and half receive similar tapes with the subliminal messages removed.The experimenter keeps track of which participant is in which group.All the participants are told that their tapes contain subliminal messages.What type of study is this

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Quizplus · Accepted Answer

This is because the participants are all aware that they are receiving weight-loss tapes with subliminal messages, but they do not know whether or not their tape actually contains subliminal messages. Therefore, the study is blinded to the participants, making it a single-blind study.

Imagine That a Group of Researchers Designed a Study to Test