Is there a difference in the variation of the yield of five-year CDs at different times? The file contains the yields for a five-year certificate of deposit (CD) for 25 banks in the United States, as of March 29, 2010 and August 23, 2010. (Data extracted from www.Bankrate.com, March 29, 2010 and August 23, 2010.) At the 0.05 level of significance, is there evidence of a difference in the variance of the yield of five-year CDs on March 29, 2010 and August 23, 2010? Assume that the population yields are normally distributed.