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Plot the market-share data. (b) Describe the trend (if any) and discuss possible causes. (c) Fit three trends (linear, exponential, quadratic). (d) Which trend model is best, and why? If none is satisfactory, explain. (e) Make a forecast for 2004 by using a trend model of your choice or a judgment forecast Asian and European Share of U.S. Light Truck Sales, 1990-2003

Year Percent Year Percent
1990 16.4 1997 15.4
1991 17.1 1998 16.2
1992 14.3 1999 18.4
1993 13.7 2000 21.2
1994 14.2 2001 23.1
1995 13.6 2002 23.9
1996 13.6 2003 26.6

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