ANOVAHandout509

ANOVAHandout509 - ANOVA Handout STAT 509 Fall 2011 For all...

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For all these problems, show fully how you got your answers! 1. Four tire brands (A, B, C, D) were tested to see whether they differed in terms of mean tread life (measured in thousands of miles). The data gathered for 14 total measurements are as follows: brand <- c('A','A','A','B','B','B','C','C','C','C','D','D','D','D') life <- c(53.0,49.2,49.6,52.5,52.1,51.9,51.2,51.7,47.8,49.1,50.9,50.1,50.1,55.2) (a) Using the formulas or (preferably) using R, fill in an ANOVA table with the appropriate numerical values. (b) Test whether the population mean tread life is equal for the three brands, using α = 0.10. 2. Consider problem 4.47 in the book. Suppose that in addition to the WC and Steel samples, we had a third (independent) sample of Iron measurements with the following data values: 631, 527, 723, 593. Suppose we wish to determine whether the population mean peak temperature is equal for the three materials. (a) Using the formulas or (preferably) using R, fill in an ANOVA table with the appropriate numerical
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This note was uploaded on 12/13/2011 for the course STAT 509 taught by Professor Chalmers during the Fall '08 term at South Carolina.

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ANOVAHandout509 - ANOVA Handout STAT 509 Fall 2011 For all...

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