Consider the monthly yields of Moody's AAA &BAA seasoned bonds from January 1919 to March 2004. The data are obtained from the Federal Reserve Bank in St. Louis. Monthly yields are averages of daily yields.
Obtain the summary statistics (sample mean, standard deviation, skewness, excess kurtosis, minimum, and maximum) of the two yield series.
Are the bond yields skewed? Do they have heavy tails? Answer the questions using 5% significance level.