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.) 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.