The following data represent the price of a random sample of used Chevy Camaros by age.

(a) Determine the least-squares regression equation, treating age as the explanatory variable.
(b) A normal probability plot of the residuals indicates that the residuals are approximately normally distributed. Test whether a linear relation exists between age and price at the a = 0.05 level of significance.
(c) Plot the residuals against the explanatory variable, age.
(d) Does a linear model seem appropriate based on the scatter diagram and residual plot?

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Age (years), x Price Age (years), x Price ($), y ($), y 15,900 1 20,365 16,463 10,988 2 16,980 10,824 9,995 19,995 11,995 4 18,650 10,995 4 10,488 2.