The file Gold contains the price in London for an ounce of gold (in US$) at the end of each quarter from 2004 through 2012.
a. Plot the data.
b. Develop an exponential trend forecasting equation with quarterly components.
c. Interpret the quarterly compound growth rate.
d. Interpret the first quarter multiplier.
e. What is the fitted value for the last quarter of 2012?
f. What are the forecasts for all four quarters of 2013?
g. Are the forecasts in (f) accurate? Explain.