The purpose of this assignment is to compute confidence intervals when population standard deviation is unknown.

1. Get the datafile named "CorporateBonds"(attached).
2. What is the sample mean years to maturity for corporate bonds and what is the sample standard deviation?
3. Develop a 95% confidence interval for the population mean years to maturity.
4. What is the sample mean yield on corporate bonds and what is the sample standard deviation?
5. Develop a 95% confidence interval for the population mean yield on corporate bonds.

Company Ticker Years to Maturity Yield HSBC 12.00 4.079 GS 9.75 5.367 C 4.75 3.332 MS 9.25 5.798 C 9.75 4.414 TOTAL 5.00 2.069 MS 5.00 4.739 WFC 10.00 3.682 TOTAL 10.00 3.270 TOTAL 3.25 1.748 BAC 9.75 4.949 RABOBK 9.75 4.203 GS 9.25 5.365 AXP 5.00 2.181 MTNA 5.00 4.366 MTNA 10.00 6.046 JPM 4.25 2.310 GE 26.00 5.130 LNC 10.00 4.163 BAC 5.00 3.699 FCX 10.00 4.030 GS 25.50 6.913 RABOBK 4.75 2.805 GE 26.75 5.138 HCN 7.00 4.184 GE 9.50 3.778 VOD 5.00 1.855 NEM 10.00 3.866 GE 1.00 0.767 C 25.75 8.204 SHBASS 5.00 2.861 PAA 10.25 3.856 GS 3.75 3.558 TOTAL 1.75 1.378 MS 4.00 4.413 WFC 1.25 0.797 AIG 5.00 3.452 BAC 29.75 5.903 MS 1.00 1.816 T 28.50 4.930