1.) The file Setters.xls contains a sample of households' yearly expenses for caring for a large dog. The population standard deviation is known: ? = $245. Calculate the sample mean, the standard error and compute a 99% confidence interval for the population's average cost of owning a large dog.

2.) The file CorporateBonds.xls contains sample data on "yield" and "years to maturity" for several bonds. For the variable "years to maturity", compute the sample mean, the sample standard deviation, and a 95% confidence interval for the population average.

3.) The file Fowle.xls contains sample data on how long it takes for a telephone survey. The population standard deviation is known: ? = 4. On average the survey is assumed to take 15 minutes or less. Based on this assumption, state the null and alternative hypothesis. Based on the sample data, calculate the test statistic and reject or not the null hypothesis with 95% confidence using the critical-value approach.

A B C Company Ticker Years to Maturity Yield 2 HSBC 12.00 4.079 3 GS 9.75 5.367 4 C 4.75 3.332 5 MS 9.25 5.798 6 C 9.75 4.414 7 TOTAL 5.00 2.069 8 MS 5.00 4.739 9 WFC 10.00 3.682 10 TOTAL 10.00 3.270 11 TOTAL 3.25 1.748 12 BAC 9.75 4.949 13 RABOBK 9.75 4.203 14 GS 9.25 5.365 15 AXP 5.00 2.181 16 MTNA 5.00 4.366 17 MTNA 10.00 6.046 18 JPM 4.25 2.310 19 GE 26.00 5.130 20 LNC 10.00 4.163 21 BAC 5.00 3.699 22 FCX 10.00 4.030 23 GS 25.50 6.913 24 RABOBK 4.75 2.805 25 GE 26.75 5.138 26 HCN 7.00 4.184 27 GE 9.50 3.778 28 VOD 5.00 1.855 29 NEM 10.00 3.866 30 GE 1.00 0.767 31 C 25.75 8.204 32 SHBASS 5.00 2.861 33 PAA 10.25 3.856 34 GS 3.75 3.558 35 TOTAL 1.75 1.378 36 MS 4.00 4.413 37 WFC 1.25 0.797 38 AIG 5.00 3.452 39 BAC 29.75 5.903 40 MS 1.00 1.816 41 T 28.50 4.930