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# 420Hw03 - STAT 420 Fall 2010 Homework#3(10 points(due...

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STAT 420 Fall 2010 Homework #3 (10 points) (due Friday, September 17, by 3:00 p.m.) 1. 4.17 (a), (b) An engineer is investigating the strength of concrete beams made from four types of cement and employing three curing processes. The breaking strengths are measured and are presented below. Curing Cement Type Process A B C D 1 14 6 22 10 2 15 8 20 7 3 10 7 18 7 a) List an appropriate model and the underlying assumptions for this situation. b) Construct the ANOVA table and test for differences in cement types and curing processes. Assume a 5-percent significance level. 2. 4.18 (a), (b) Referring back to Problem 4.17 , suppose that two additional beams are made for each combination of cement type and curing process and the breaking strengths determined. The complete layout follows. Curing Cement Type Process A B C D 1 14, 14, 10 6, 9, 7 22, 25, 20 10, 11, 13 2 15, 12, 10 8, 4, 11 20, 15, 19 7, 9, 10 3 10, 8, 10 7, 4, 7 18, 21, 22 7, 6, 6 a) Specify an appropriate model for this situation and the underlying assumptions.

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420Hw03 - STAT 420 Fall 2010 Homework#3(10 points(due...

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