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Quiz6b_KEY_Sp11

Quiz6b_KEY_Sp11 - B Name_KEY 28 March 2011 IE330 Spring...

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Name: ___________KEY_________________________________ B 28 March 2011 IE330 Spring 2011 Closed book, closed notes, no calculators Quiz #6b For all questions, please refer to the ANOVA output shown below. (From Ogunnaike, B. A. (2010). Random Phenomena: Fundamentals of Probability and Statistics for Engineers . CRC Press: Boca Raton, FL. Shown below is data taken in an experimental study to determine if different brands of tires wear differently. The response is the amount of wear on the tires in coded units, and the tire brand is either A, B, or C. One-way ANOVA: A, B, C Source DF SS MS F P Factor 2 135.2 67.6 4.69 0.040 Error 9 129.8 14.4 Total 11 264.9 S = 3.797 R-Sq = 51.02% R-Sq(adj) = 40.14% Individual 95% CIs For Mean Based on Pooled StDev Level N Mean StDev -+---------+---------+---------+-------- A 4 45.500 2.646 (--------*--------) B 4 44.000 5.477 (--------*--------) C 4 51.750 2.500 (--------*-------) -+---------+---------+---------+-------- 40.0 45.0 50.0 55.0 Tukey 95% Simultaneous Confidence Intervals All Pairwise Comparisons Individual confidence level = 97.91% A subtracted from: Lower Center Upper ---------+---------+---------+---------+ B -8.999 -1.500 5.999 (--------*--------) C -1.249 6.250 13.749 (---------*--------) ---------+---------+---------+---------+ -8.0 0.0 8.0 16.0 B subtracted from: Lower Center Upper ---------+---------+---------+---------+ C 0.251 7.750 15.249 (---------*--------) ---------+---------+---------+---------+ -8.0 0.0 8.0 16.0
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Name: ___________KEY_________________________________ B 1. (10 points) TRUE or FALSE. There are three levels to each factor in this experiment.
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