Test: AP Statistics

1.

Which of the following is an example of a double blind experiment? 

An experiment in which neither the test subjects nor the researchers know who is receiving the treatment and who is receiving the placebo

An experiment in which test subjects know which therapy they are receiving, but researchers are unaware

An experiment in which researchers know which therapy test subjects are receiving, but test subjects are unaware 

An experiment in which both test subjects and researchers are aware of who is receiving the treatment and who is receiving the placebo

None of these are an example of a double blind experiment

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