A cardiologist working with patients suffering from hypertension measures the daily resting blood pressure of his 15 patients for a three-week period. For another three weeks, each patient is treated with a drug designed to reduce hypertension, and blood pressure is measured daily. For another three weeks, each patient receives the drug and receives training in biofeedback techniques designed to reduce hypertension, and again daily blood pressure are taken. Order of treatment is alternated. The cardiologist is interested in whether there is any difference in mean blood pressure during the control period and the two treatment periods. Because he finds that the data do not meet the assumptions of a parametric test, he chooses another test. What parametric test would you choose to answer the
question?
What will be an ideal response?
Correct Answer:
Friedman Test
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