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Researchers would like to compare meditation and exercise to see which is more effective for reducing stress. One hundred people who suffer from high stress volunteer to participate in a study for ten weeks. Participants will either be given a 10-week course in meditation or will participate in a 10-week exercise program. The researchers must decide whether to randomly assign the volunteers to the two programs, or allow them to choose.
-Suppose participants are randomly assigned to the two programs and a psychologist measures their stress levels before and after the 10-week program, without being told who is in which program. This experiment would be
A) Single blind as long as the participants are not told the results of the stress level measurements.
B) Single blind because the psychologist doesn't know who is in which program, but the participants do know.
C) Double blind as long as the participants are not told the results of the stress level measurements.
D) Neither single nor double blind.

Question

Use the following information for questions:
 Researchers would like to compare meditation and exercise to see which is more effective for reducing stress. One hundred people who suffer from high stress volunteer to participate in a study for ten weeks. Participants will either be given a 10-week course in meditation or will participate in a 10-week exercise program. The researchers must decide whether to randomly assign the volunteers to the two programs, or allow them to choose.
-Suppose participants are randomly assigned to the two programs and a psychologist measures their stress levels before and after the 10-week program, without being told who is in which program. This experiment would be
A) Single blind as long as the participants are not told the results of the stress level measurements.
B) Single blind because the psychologist doesn't know who is in which program, but the participants do know.
C) Double blind as long as the participants are not told the results of the stress level measurements.
D) Neither single nor double blind.

Quizplus · Accepted Answer

The experiment is single blind because the psychologist, who measures the stress levels, does not know which program each participant is in, but the participants are aware of their own program. This setup prevents the psychologist's biases from affecting the outcome assessment.

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