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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

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