The following output summarizes the fit of an analysis of covariance to the data in Exercise 35. The variable D denotes a dummy variable, with D = + for values colored green and 0 otherwise.
(a) Does the fit of the model suggest parallel equations for the two groups?
(b) How would the output change if the coding of the dummy variable D were reversed (so that 0s became 1s and vice versa)?
(c) What should be the next step in analyzing these data, specifically thinking of the form of the fitted model?

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