The U.S.–Canada exchange rate has fluctuated over the past 45 years. Can any single commodity explain these fluctuations? Is it oil, for example? Canada sells a lot of oil to the United States. It may be lumber or gold. A statistician set out to investigate the U.S.–Canada exchange rate and its underlying causes. We have stored the monthly exchange rate (the ratio of the value of the U.S. dollar to the value of the Canadian dollar) (Ch04: U.S.–Canada Exchange rate) from May 1986 to April 2016. The other prices we recorded are listed below. For each compute the coefficient of correlation with the U.S.–Canada exchange rate and briefly describe what the statistic tells you. Price of West Texas crude oil (U.S. dollars per barrel) 

Price of gold (U.S. dollars per troy ounce)

Price of silver (U.S. cents per troy ounce)

Price of copper (U.S. dollars per metric ton)

Price of beef (U.S. cents per pound)