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Quiz7c_KEY_Sp11

# Quiz7c_KEY_Sp11 - C Name_KEY 6 April 2011 IE330 Spring 2011...

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Name: _______________KEY_______________________ C 6 April 2011 IE330 Spring 2011 Closed book, closed notes, no calculators Quiz #7c For all questions, please refer to the ANOVA output shown below. (From Navidi, W. (2008). Statistics for Engineers and Scientists, 2 nd Edition . McGraw-Hill: New York) Shown below are ANOVA results from data collected on the minimum breaking strength (in lbf) of wires within the wire bundles that make up the cables for the Williamsburg Bridge in New York City. Wire samples were taken from different depths within the cables, and from different circumferential positions within the cables. Assume higher strength is better and all assumptions of the ANOVA have been met. Analysis of Variance for Strength of wire (lbf), using Adjusted SS for Tests Source DF Seq SS Adj SS Adj MS F P Circumferential position 3 1563237 1563238 521079 3.55 0.021 Depth 3 2213463 2213463 737821 5.02 0.004 Circumferential position*Depth 9 970075 970075 107786 0.73 0.676 Error 48 7052000 7052000 146917 Total 63 11798775 S = 383.297 R-Sq = 40.23% R-Sq(adj) = 21.55% Tukey 95.0% Simultaneous Confidence Intervals Response Variable Strength of wire (lbf)

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Quiz7c_KEY_Sp11 - C Name_KEY 6 April 2011 IE330 Spring 2011...

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