The hours of relief are measured under a placebo, Brand A, and Brand B sinus medicines. Call these treatment 1, treatment 2, and treatment 3, respectively. They are each given in succession, in random order, to each subject with two days between, each treatment. Suppose the data are

(a) Provide a decomposition for the observations from this randomized block experiment.
(b) Find the sum of squares for each array.
(c) Determine the degrees of freedom by checking the constraints for each array.

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4020 3 773 B2-086 - I 75 123