From 2006 to 2012, the value of precious metals fluctuated dramatically. The file Metal Indices contains the total rate of return (in percentage) for platinum, gold, and silver from 2006 through 2012. (Data extracted from finance.yahoo.com, March 29, 2013.)
a. Construct sparklines for rate of return per year for platinum, gold, and silver from 2006 through 2012.
b. What conclusions can you reach concerning the rates of return of the three precious metals?
c. Compare the results of (b) to those of Problem 17.6 (b).