(a) Plot the market-share data. (b) Describe the trend (if any) and discuss

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possible causes. (c) Fit? (a) 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.
 
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