Solved: The pull strength of a wire bond is an important

Chapter 12, Problem 12.57

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The pull strength of a wire bond is an important characteristic. The following data give information on pull strength y, die height x1, post height x2, loop height x3, wire length x4, bond width on the die x5, and bond width on the post x6. (From Myers, Montgomery, and Anderson-Cook, 2009.) (a) Fit a regression model using all independent variables. (b) Use stepwise regression with input signicance level 0.25 and removal signicance level 0.05. Give your nal model. (c) Use all possible regression models and compute R2, Cp, s2, and adjusted R2 for all models.(d) Give the nal model. (e) For your model in part (d), plot studentized residuals (or R-Student) and comment.yx 1 x2 x3 x4 x5 x6 8.0 8.3 8.5 8.8 9.0 9.3 9.3 9.5 9.8 10.0 10.3 10.5 10.8 11.0 11.3 11.5 11.8 12.3 12.5 5.2 5.2 5.8 6.4 5.8 5.2 5.6 6.0 5.2 5.8 6.4 6.0 6.2 6.2 6.2 5.6 6.0 5.8 5.6 19.6 19.8 19.6 19.4 18.6 18.8 20.4 19.0 20.8 19.9 18.0 20.6 20.2 20.2 19.2 17.0 19.8 18.8 18.6 29.6 32.4 31.0 32.4 28.6 30.6 32.4 32.6 32.2 31.8 32.6 33.4 31.8 32.4 31.4 33.2 35.4 34.0 34.2 94.9 89.7 96.2 95.6 86.5 84.5 88.8 85.7 93.6 86.0 87.1 93.1 83.4 94.5 83.4 85.2 84.1 86.9 83.0 2.1 2.1 2.0 2.2 2.0 2.1 2.2 2.1 2.3 2.1 2.0 2.1 2.2 2.1 1.9 2.1 2.0 2.1 1.9 2.3 1.8 2.0 2.1 1.8 2.1 1.9 1.9 2.1 1.8 1.6 2.1 2.1 1.9 1.8 2.1 1.8 1.8 2.0