Calculate the $95\%$ prediction intervals for the four different investments included in the following

table.

Small Stocks S&P $500$ Corporate Bonds T$-$Bills

Average Return $18\mathrm{.}04\%11\mathrm{.}71\%6\mathrm{.}16\%3\mathrm{.}39\%$

Standard Deviation of returns $39\mathrm{.}25\%19\mathrm{.}76\%6\mathrm{.}36\%3\mathrm{.}12\%$