420Hw10 - STAT 420(10 points(due Friday November 9 by 3:00...

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STAT 420 Fall 2007 Homework #10 (10 points) (due Friday, November 9, by 3:00 p.m.) 1. 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. Referring back to problem 1, 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
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This note was uploaded on 04/29/2010 for the course STAT stat 420 taught by Professor Stepanov during the Spring '07 term at University of Illinois at Urbana–Champaign.

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420Hw10 - STAT 420(10 points(due Friday November 9 by 3:00...

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