Calculate the95% confidence intervals for the four different investments included in the following table.

	small stocks	s&p 500	corporate bonds	t-bills
Average return	20.89 %	11.64 %	5.73 %	4.78 %
Standard deviation of returns	42.08 %	20.37 %	6.37 %	3.59 %

a)The95% confidence interval of small stocks is between ____% and ____ %

b)The95% confidence interval of s&p 500 is between ____% and ____ % c)The95%confidence interval of corporate bonds is between ____% and ____ %

d)The95%confidence interval of t-bill is between ____% and ____ %