How to establish blind experiments Practice Test

An experiment in which the researchers and test subjects are unaware of who is receiving a placebo and who is receiving a therapy.

An experiment in which the researchers are aware of who is receiving a placebo and who is receiving a therapy, but the test subjects are unaware.

An experiment in which the researchers and test subjects are aware of who is receiving a placebo and who is receiving a therapy.

Two of the answers are correct

An experiment in which the test subjects are aware of who is receiving a placebo and who is receiving a therapy, but the researchers are unaware.