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A chemist is working on a new coating for transparencies used in ink-jet printers. The current formulation causes the transparency to curl. There are two components the chemist has data on that are believed to affect curl. The data from this study are in curl. txt.

(a) Make scatter plots of the response variable against each of the predictor variables and comment on the plots.

(b) Fit model (3.4.1) and report the fitted model.

(d) Compute the residuals.

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