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Make an Excel graph of the data on U.S. diesel new car sales. (b) Discuss the underlying causes that might explain the trend. (c) Use Excel, MegaStat, or MINITAB to fit three trends (linear, quadratic, and exponential) to the time series. (d) Which trend model do you think is best to make forecasts for the next 3 years? Why? (e) Use each of the three fitted trend equations to make numerical forecasts for 2004, 2005, and 2006. How much difference does the choice of model make? Which forecasts do you trust the most, and why? (f) If you have access to Ward's Automotive Yearbook, check your forecasts. How accurate were they?
U.S. Diesel New Car Sales, 1993-2003Year Sales1993 2,8001994 3,5771995 3,1391996 8,4691997 7,3311998 10,9721999 13,5732000 22,6342001 15,0772002 31,4302003 38,524
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