Are gasoline prices higher during the height of the summer vacation season than at other times? The file Gas Prices contains the mean monthly prices (in S/gallon) for unleaded gasoline in the United States from January 2006 to July 2012. (Data extracted from U.S. Energy Information Administration, www.eia.doe.gov/petroleum/data.ctm.)
a. Construct a time-series plot.
b. Develop an exponential trend forecasting equation with monthly components.
c. Interpret the monthly compound growth rate.
d. Interpret the monthly multipliers.
e. Write a short summary of your findings.