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exponential trend forecasting

See attached file.

Are gasoline prices higher during the height of the summer vacation season? The table stored in the file unleaded.xls contains the mean monthly prices (in dollars per gallon) for unleaded gasoline in the United States from 2000 to 2005.

a) Construct a time series plot

b) Develop an exponential trend forecasting equation for monthly data

c) Interpret the monthly compound growth rate

d) Interpret the monthly multipliers