The file contains the yields for a one-year certificate of deposit (CD) and a five-year CD for 24 banks in the United States, as of June 21, 2012. (Data extracted from www.Bankrate.com, June 21, 2012.) For each type of investment, decide whether the data appear to be approximately normally distributed by
a. Comparing data characteristics to theoretical properties.
b. Constructing a normal probability plot.