313 Is there a difference in the variation of the yields of

3.13 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 a five-year certificate of deposit (CD), for 23 banks in the United States, as of April 4, 2011.

Source: Data extracted from www.Bankrate.com, April 4, 2011.

a. For one-year and five-year CDs, separately compute the variance, standard deviation, range, and coefficient of variation.

b. Based on the results of (a), do one-year or five-year CDs have more variation in the yields offered? Explain.

Solution