The following data are the number of Harley- Davidson motorcycles sold worldwide for 2003 through 2006 (thousands). Given these data and the trend equations, use the MAD criterion to determine which equation is the better fit. Repeat the evaluation, using the MSE criterion.

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x= y= Year Year Code Sales 2003 2004 2 317.3 p=275.15+18.60x 2005 3 329.0 2006 4 349.2 Quadratic 129 Linear: = 267.65 + 26-10x -1.50x2