A regression model from the collection of houses in Exercise 15 shows the following:

a) The slope of Age is negative. Does this indicate that older houses cost less, on average? Explain.
b) Why did the model subtract 38.5122 from Age in the quadratic term?

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Variable Ceff SE(Coeff) t-ratio P-value Intercept 217854.85 4197.417 51.90 <0.0001 Age (Age-38.5122)2 20.401223 1.327713 15.37 <0.0001 -1754.254 127.3356 -13.78 <0.0001