(a) Check the calculation of residuals by finding their sum. What should the sumbe? Does
Chapter 0, Problem 24.32(choose chapter or problem)
(a) Check the calculation of residuals by finding their sum. What should the sumbe? Does the sum have that value (up to roundoff error)?(b) Plot the residuals against thickness (the explanatory variable). Does your plotshow a systematically nonlinear relationship? Does it show systematic change inthe spread about the regression line?(c) Make a histogram of the residuals. The pattern, with just 12 observations, isirregular. More advanced methods show that the distribution is reasonablyNormal.
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