Consider the response variable miles per gallon on highways and the two predictor variables x1 = engine volume (liter) and x2 = size of battery (volt). Using a recent government Fuel Economy Guide, and the data on hybrid-electric cars and SUVs, we obtain the regression analysis given in Table 9.
(a) Identify the least squares estimates

and

(b) What model is suggested from this analysis?
(c) What is the proportion of y variability explained by the regression on x1 and x2?
(d) Estimate a 2.

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