Consider monthly returns of Cisco Systems stock (CSCO), S&P 500 index, and T-Bill from Jan 1994 until Nov 2005 (provided in CSCO_returns.xls). Calculate the CAPM beta for Cisco Systems (provide 4 digits after the decimal point).

Date	CSCO	S&P500	T-Bill
Nov-05	0.17%	-0.35%	0.32%
Oct-05	-2.62%	-1.77%	0.32%
Sep-05	1.70%	0.69%	0.29%
Aug-05	-7.99%	-1.12%	0.29%
Jul-05	0.37%	3.60%	0.28%
Jun-05	-1.65%	-0.01%	0.26%
May-05	12.33%	3.00%	0.24%
Apr-05	-3.47%	-2.01%	0.24%
Mar-05	2.70%	-1.91%	0.23%
Feb-05	-3.44%	1.89%	0.22%
Jan-05	-6.63%	-2.53%	0.20%
Dec-04	3.04%	3.25%	0.18%
Nov-04	-2.39%	3.86%	0.18%
Oct-04	6.13%	1.40%	0.16%
Sep-04	-3.52%	0.94%	0.14%
Aug-04	-10.33%	0.23%	0.13%
Jul-04	-11.73%	-3.43%	0.12%
Jun-04	5.95%	1.80%	0.11%
May-04	6.98%	1.21%	0.09%
Apr-04	-11.29%	-1.68%	0.08%
Mar-04	1.77%	-1.64%	0.08%
Feb-04	-9.92%	1.22%	0.08%
Jan-04	6.11%	1.73%	0.08%
Dec-03	6.74%	5.08%	0.08%
Nov-03	8.46%	0.71%	0.08%
Oct-03	6.84%	5.50%	0.08%
Sep-03	2.35%	-1.19%	0.08%
Aug-03	-1.80%	1.79%	0.08%
Jul-03	16.08%	1.62%	0.08%
Jun-03	2.32%	1.13%	0.07%
May-03	9.40%	5.09%	0.09%
Apr-03	15.56%	8.10%	0.09%
Mar-03	-7.15%	0.84%	0.09%
Feb-03	4.56%	-1.70%	0.10%
Jan-03	2.06%	-2.74%	0.10%
Dec-02	-12.20%	-6.03%	0.10%
Nov-02	33.45%	5.71%	0.10%
Oct-02	6.68%	8.64%	0.12%
Sep-02	-24.17%	-11.00%	0.13%
Aug-02	4.78%	0.49%	0.14%
Jul-02	-5.45%	-7.90%	0.14%
Jun-02	-11.60%	-7.25%	0.14%
May-02	7.71%	-0.91%	0.14%
Apr-02	-13.47%	-6.14%	0.14%
Mar-02	18.64%	3.67%	0.15%
Feb-02	-27.93%	-2.08%	0.14%
Jan-02	9.33%	-1.56%	0.14%
Dec-01	-11.40%	0.76%	0.14%
Nov-01	20.80%	7.52%	0.14%
Oct-01	38.92%	1.81%	0.17%
Sep-01	-25.41%	-8.17%	0.19%
Aug-01	-15.04%	-6.41%	0.27%
Jul-01	5.60%	-1.07%	0.29%
Jun-01	-5.50%	-2.50%	0.30%
May-01	13.43%	0.51%	0.30%
Apr-01	7.40%	7.68%	0.32%
Mar-01	-33.26%	-6.42%	0.35%
Feb-01	-36.73%	-9.23%	0.39%
Jan-01	-2.12%	3.46%	0.40%
Dec-00	-20.11%	0.41%	0.48%
Nov-00	-11.14%	-8.01%	0.50%
Oct-00	-2.48%	-0.49%	0.51%
Sep-00	-19.48%	-5.35%	0.50%
Aug-00	4.86%	6.07%	0.51%
Jul-00	2.96%	-1.63%	0.50%
Jun-00	11.63%	2.39%	0.48%
May-00	-17.87%	-2.19%	0.46%
Apr-00	-10.32%	-3.08%	0.47%
Mar-00	16.96%	9.67%	0.48%
Feb-00	20.73%	-2.01%	0.47%
Jan-00	2.22%	-5.09%	0.46%
Dec-99	20.09%	5.78%	0.43%
Nov-99	20.54%	1.91%	0.43%
Oct-99	7.93%	6.25%	0.41%
Sep-99	1.12%	-2.86%	0.39%
Aug-99	9.11%	-0.63%	0.40%
Jul-99	-3.57%	-3.20%	0.39%
Jun-99	18.24%	5.44%	0.39%
May-99	-4.42%	-2.50%	0.38%
Apr-99	4.09%	3.79%	0.37%
Mar-99	12.02%	3.88%	0.36%
Feb-99	-12.33%	-3.23%	0.38%
Jan-99	20.22%	4.10%	0.36%
Dec-98	23.14%	5.64%	0.36%
Nov-98	19.62%	5.91%	0.37%
Oct-98	1.94%	8.03%	0.35%
Sep-98	13.19%	6.24%	0.35%
Aug-98	-14.47%	-14.58%	0.40%
Jul-98	4.04%	-1.16%	0.41%
Jun-98	21.75%	3.94%	0.41%
May-98	3.19%	-1.88%	0.41%
Apr-98	7.11%	0.91%	0.40%
Mar-98	3.83%	4.99%	0.42%
Feb-98	4.47%	7.04%	0.43%
Jan-98	13.13%	1.02%	0.42%
Dec-97	-3.03%	1.57%	0.43%
Nov-97	5.16%	4.46%	0.42%
Oct-97	12.19%	-3.45%	0.42%
Sep-97	-2.99%	5.32%	0.41%
Aug-97	-5.32%	-5.75%	0.42%
Jul-97	18.50%	7.81%	0.43%
Jun-97	-0.93%	4.35%	0.42%
May-97	30.96%	5.86%	0.40%
Apr-97	7.48%	5.84%	0.43%
Mar-97	-13.43%	-4.26%	0.43%
Feb-97	-20.26%	0.59%	0.42%
Jan-97	9.62%	6.13%	0.42%
Dec-96	-6.23%	-2.15%	0.42%
Nov-96	9.59%	7.34%	0.42%
Oct-96	-0.29%	2.61%	0.42%
Sep-96	17.75%	5.42%	0.41%
Aug-96	1.91%	1.88%	0.43%
Jul-96	-8.59%	-4.57%	0.43%
Jun-96	3.45%	0.23%	0.42%
May-96	5.56%	2.29%	0.42%
Apr-96	11.84%	1.34%	0.42%
Mar-96	-2.46%	0.79%	0.42%
Feb-96	14.29%	0.69%	0.41%
Jan-96	11.33%	3.26%	0.41%
Dec-95	-11.13%	1.74%	0.41%
Nov-95	8.35%	4.10%	0.44%
Oct-95	12.53%	-0.50%	0.44%
Sep-95	4.93%	4.01%	0.44%
Aug-95	17.74%	-0.03%	0.44%
Jul-95	10.32%	3.18%	0.45%
Jun-95	15.64%	2.13%	0.45%
May-95	9.46%	3.63%	0.47%
Apr-95	4.72%	2.80%	0.47%
Mar-95	12.77%	2.73%	0.48%
Feb-95	1.62%	3.61%	0.48%
Jan-95	-5.13%	2.43%	0.49%
Dec-94	8.94%	1.23%	0.46%
Nov-94	7.19%	-3.95%	0.46%
Oct-94	9.87%	2.08%	0.42%
Sep-94	10.14%	-2.69%	0.39%
Aug-94	17.95%	3.76%	0.38%
Jul-94	-10.00%	3.15%	0.36%
Jun-94	-5.80%	-2.68%	0.35%
May-94	-17.86%	1.24%	0.35%
Apr-94	-11.58%	1.15%	0.32%
Mar-94	-7.32%	-4.57%	0.29%
Feb-94	1.99%	-3.00%	0.28%
Jan-94	12.29%	3.25%	0.25%