consider the following

Year End	Market Realized Return	Microsoft Realized Return
1996	21.2%	88.3%
1997	30.3%	56.4%
1998	22.3%	114.6%
1999	25.3%	68.4%
2000	-11.0%	-62.8%
2001	-11.3%	52.7%
2002	-20.8%	-22.0%
2003	33.1%	6.9%
2004	13.0%	9.2%
2005	7.3%	-0.9%

Suppose that you want to use the 10 year historical average return on the market to forecast the expected future return on the S & P 500. Calculate the 95% confidence interval for your estimate of the expected return. Show all calculations