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Chapter 13: Nonlinear and Multiple Regressionc. Comparing the changes in the ˆβ i' s to the s ' sβˆi, none of the changes is all thatsubstantial (the largest is 1.2sd’s for the change in ˆβ1when point #2 is deleted). Thusalthough h 44 is large, indicating a potential high influence of point #4 on the fit, the actualinfluence does not appear to be great.Supplementary Exercises65.a.Boxplots of ppv by prism quality(means are indicated by solid circles)1200ppv700200crackedprism qualiltynot crackedA two-sample t confidence interval, generated by Minitab:Two sample T for ppvprism qu N Mean StDev SE Meancracked 12 827 295 85not cracke 18 483 234 5595% CI for mu (cracked ) - mu (not cracke): ( 132, 557)428

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