In a double-blind experiment, which of the following is true?
A. The subjects are not told the purpose of the experiment.
B. The experimenter does not know which subjects are in the treatment group.
C. The experiments are conducted in a specially darkened and soundproof room to eliminate the influence of chance environmental variables.
D. Neither the subjects nor the experimenter know who is in the treatment group.
E. Each experimental subject is assigned to exactly two blocks.

Question

In a double-blind experiment, which of the following is true?
  		A. 	The subjects are not told the purpose of the experiment.
  		B. 	The experimenter does not know which subjects are in the treatment group.
  		C. 	The experiments are conducted in a specially darkened and soundproof room to eliminate the influence of chance environmental variables.
  		D. 	Neither the subjects nor the experimenter know who is in the treatment group.
  		E. 	Each experimental subject is assigned to exactly two blocks.

superhelp101 · Answer

it is D.  a double blind experiment is an experiment in which information about the test that might lead to bias in the results is concealed from the tester, the subject, or both until after the test. Bias may be intentional or unconscious. If both tester and subject are blinded, the trial is a double-blind trial.

superhelp101 · Answer

got it?