Question: a Plot the data on U S general aviation shipments b

(a) Plot the data on U.S. general aviation shipments.
(b) Describe the pattern and discuss possible causes.
(c) Would a fitted trend be helpful? Explain.
(d) Make a similar graph for 1993­2008 only. Would a fitted trend be helpful in making a prediction for 2009?
(e) Fit a trend model of your choice to the 1993­2008 data.
(f) Make a forecast for 2009, using either a fitted trend model or a judgment forecast.
(g) Might it be best to ignore earlier years in this data set?

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