A researcher has developed a set of breathing exercises and would like to investigate whether they can help to reduce anxiety.She designs an experiment as follows.She will obtain a group of volunteers suffering from anxiety.They will be given a test to measure the level of their anxiety.Volunteers will be randomly assigned to one of three groups.Those in group 1 will do breathing exercises for 15 minutes per day,those in group 2 will do breathing exercises for 30 minutes per day,and those in group 3 (control group)will do no breathing exercises.After a suitable time period,each person will again take the anxiety test.The researcher will compare the average change in score for the three groups.Is it possible to double blind this experiment? Explain.

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Michael Alemu · Accepted Answer

Final Answer : No.Provided that the person administering the anxiety test and evaluating the level of anxiety is unaware of the patients' treatments,the experiment will be single blind.However ,the patients cannot be blinded to whether they are doing breathing exercises so it is not possible to double blind the experiment.

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