Is there a difference in the yields of different types of investments? The file CD Rate contains the yields for a one- year certificate of deposit (CD) and a five- year CD for 22 banks in the United States as of March 12, 2014. (Data extracted from www.Bankrate.com, March 12, 2014.)

a. Construct a 95% confidence interval estimate for the mean yield of one- year CDs.

b. Construct a 95% confidence interval estimate for the mean yield of five- year CDs.

c. Compare the results of (a) and (b).