Are gasoline prices higher during the height of the summer vacation season? The data in the attached document called "Unleaded" which gives the mean monthly prices (in dollars per gallon) for unleaded gasoline in the United States from January 2003 to February 2009. Please use Excel when possible.
(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.
(e) Write a short summary of your findings.