Below are fitted regressions based on used vehicle ads. Observed ranges of X are shown. The assumed regression model is Asking Price = f (VehicleAge).
(a) Interpret the slopes.
(b) Are the intercepts meaningful? Explain.
(c) Assess the t of each model.
(d) Is a bivariate model adequate to explain vehicle prices? If not, what other predictors might be considered? (Data are from Detroit's AutoFocus 4, Issue 38 [September 17­23, 2004]. Data are for educational purposes only and should not be viewed as a guide to vehicle prices.)

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Vehicde Intercept Slope R MinA ge Max Age Ford Explorer Ford F150 Pickup 43 26,164 -2,239 713 Ford Mustang 3 21, Ford Taurus 31 22,252-2,452 643 6 37 10 14 -1,69 328 -906 679 32 13,160