Is there a difference in the variation of the yields of different types of investments?The file CDRate contains the yields for a one-year certificate of deposit (CD) and afive-year certificate of deposit (CD), for 23 banks in the United States, as of April 4, 2011.
BankOne-YearFive-YearAIG1.152.20Ally1.242.40American0.852.35Astoria Federal0.752.65Bank of Internet USA1.212.49Centennial0.602.12Colorado federal1.252.30Discover1.202.30First Internet Bank of Indiana1.002.40Goldwater1.242.39Intervest National1.202.39Lone Star0.802.38MetLife1.251.90Nationwide1.202.55newDominion1.162.00Nova0.902.25OneWest1.202.55Salem Five0.602.00State farm0.802.43National Republic Bank of Chicago1.262.27Transportation Alliance1.202.28USAA0.912.25VirtualBank1.112.22
a. For one-year and five-year CDs, separately compute the variance, standard deviation, range, and coefficient of variance.
b. Based on the results of (a), do one-year or five-year CDshave more variation in the yields offered? Explain.