The file Currency contains the exchange rates of the Canadian dollar, the Japanese yen, and the English pound from 1980 to 2012, where the Canadian dollar, the Japanese yen, and the English pound are expressed in units per U.S. dollar.
a. Construct time-series plots for the yearly closing values of the Canadian dollar, the Japanese yen, and the English pound.
b. Explain any patterns present in the plots.
c. Write a short summary of your findings.
d. Construct separate scatter plots of the value of the Canadian dollar versus the Japanese yen, the Canadian dollar versus the English pound, and the Japanese yen versus the English pound.
e. What conclusions can you reach concerning the value of the Canadian dollar, Japanese yen, and English pound in terms of the U.S. dollar?