Question: Refer to the data in Exercise 11-5 on y steam usage and x average monthly temperature. (a) What proportion of total variability is accounted for

Refer to the data in Exercise 11-5 on y steam usage and x average monthly temperature.

(a) What proportion of total variability is accounted for by the simple linear regression model?

(b) Prepare a normal probability plot of the residuals and interpret this graph.

(c) Plot residuals versus and x. Do the regression assumptions appear to be satisfied?

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