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10 (a) Choose one time-series describing Spirit Airlines and make a line chart. (b) Describe the trend (if any) and discuss possible causes.

14.10 (a) Choose one time-series describing Spirit Airlines and make a line chart. (b) Describe the trend
(if any) and discuss possible causes. (c) Fit both a linear and an exponential trend to the data.
(d) Which model is preferred? Why? (e) Make a forecast for 2003, using a trend model of your
choice (or a judgment forecast).
Growth of Spirit Airlines, 1998–2002
Year Revenue ($ mil) Aircraft FT Employees
1998 131 14 860
1999 227 20 1,440
2000 311 24 1,729
2001 354 27 2,094
2002 403 28 2,345

This question was asked on May 16, 2010.

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