Hail damage to cotton, in pounds per planted acre, was recorded for four counties for three years. The data are shown in Table 14.14. Using years as blocks use the Friedman test to determine whether there was a difference in hail damage among the four counties. If a difference exists, determine the nature of this difference with a multiple comparison test. Also discuss why this test was recommended.

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Table 14.14 Data for Exercise 7. YEAR County 1 2 3 PBCR 49 141 13. 64 175 30 179 9 21877