Calculate the 95% confidence intervals for the four different investments included in the following table.

Small Stocks S&P 500 Corporate Bonds T-Bills

Average Return 20.43% 12.93% 6.79% 4.78%

Standard Deviation of returns 42.06% 20.84% 6.67% 3.52%

The 95% confidence interval of small stocks is between ____% and ____%. (Round to two decimal places and put the lower number first.)

The 95% confidence interval of the S&P500 is between ____% and ____%. (Round to two decimal places and put the lower number first.)

The 95% confidence interval of corporate bonds is between ____% and ____%. (Round to two decimal places and put the lower number first.)

The 95% confidence interval of T-bills is between ___% and ____%. (Round to two decimal places and put the lower number first.)