An experiment is undertaken to study the effects of four different medical treatments on the recovery time for a medical disorder. Six physicians are involved in the study. One patient with the disorder is sampled for each physician under each treatment, resulting in 24 patients in the study. Recovery time in days is the observed measurement. The data are given here.

Use the Friedman test and α = .01 to determine whether there is a significant difference in recovery times for the four different medicaltreatments.

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Treatment 4 4. 4 5 Physician 3 4 4 4 4