An experiment was designed for personnel in the Department of Animal Science at Virginia Polytechnic Institute and State University with the purpose of studying urea and aqueous ammonia treatment of wheat straw. The purpose was to improve nutrition value for male sheep. The diet treatments are: control; urea at feeding: ammonia-treated straw; urea-treated straw. Twenty-four sheep were used in the experiment, and they were separated according to relative weight. There were six sheep in each homogeneous group. Each of the six was given each of the four diets in random order. For each of the 24 sheep the percent dry matter digested was measured. The data follow.(a) Use a randomized block type of analysis to test for differences between the diets. Use ? = 0.05.(b) Use Dunnett's test to compare the three diets with the control. Use ? = 0.05.(c) Does a normal probability plot of residuals?

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Group by Weight (block) 1 2 3 4 5 6 Diet Control 32.68 36.22 36.36 40.95 34.99 33.89 Urea at feeding 35.90 38.73 37.55 34.64 37.36 34.35 Ammonia treated 49.43 53.50 52.86 45.00 47.20 49.76 Urea treated 46.58 42.82 45.41 45.08 43.81 47.40