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.)