Refer to Exercise 13.9. Suppose that the sand used in the mixes for samples 14 came from
Chapter 13, Problem 13.76(choose chapter or problem)
Refer to Exercise 13.9. Suppose that the sand used in the mixes for samples 14 came from pit A, the sand used for samples 58 came from pit B, and the sand for samples 912 came from pit C. Analyze the data, assuming that the requirements for a randomized block are met with three blocks consisting, respectively, of samples 1, 2, 3, and 4; samples 5, 6, 7, and 8; and samples 9, 10, 11, and 12. a At the 5% significance level, is there evidence of differences in concrete strength due to the sand used? b Is there evidence, at the 5% significance level, of differences in average strength among the four types of concrete used? c Does the conclusion of part (b) contradict the conclusion that was obtained in Exercise 13.9?
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