Question: Consider the simple linear regression model fi t to the copolyester viscosity data in Problem 2.14. a. Construct a normal probability plot of the unscaled

Consider the simple linear regression model fi t to the copolyester viscosity data in Problem 2.14.

a. Construct a normal probability plot of the unscaled residuals. Does there seem to be any problem with the normality assumption?

b. Repeat part a using the studentized residuals. Is there any substantial difference in the two plots?

c. Construct and interpret a plot of the residuals versus the predicted response.

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