Consider the daily simple returns of american express (axp), crsp valueweighted index (vw), crsp equal-weighted index (ew), and the s& p composite index (sp) from september 01, 2001 to september 30, 2011. returns of indices include dividends. the data are in the file d-axp3dx-0111.txt (date, axp, vw, ew, sp). (a) compute the sample mean, standard deviation, skewness, excess kurtosis, minimum, and maximum of each simple return series. references 37 (b) transform the simple returns to log returns. compute the sample mean, standard deviation, skewness, excess kurtosis, minimum, and maximum of each log return series. (c) test the null hypothesis that the mean of the log returns of axp stock is zero. use 5% significance level to draw your conclusion

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

A5 kg block of fe is dropped into a very large vat of water. the fe and water initial temperatures are 95 and 25 c, respectively. the fe final temperature is 25 c and the water can be treated as a thermal reservoir,. treated as a thermal reservoir take the water to be the system and determine the entropy generation. report vour answer in kj/k.

Steam at a pressure of 100 kpa and a quality of 50% initially fills a rigid vessel having a volume of 0.5 m^3. the steam is then heated, causing the pressure in the vessel to rise to 150 kpa. determine: i. the mass of the steam in the vessel. ii. the temperature and quality of the steam after the heating process. ii the mass of the vapour, mg and liquid, m in the vessel after the heating process. if the steam in the vessel is now further heated, what would the pressure and temperature in the vessel be when all steam has turned into saturated vapour? b. sketch the processes in part (a) and part (b) on p-v and t-v diagrams, indicating clearly the temperatures, pressures and the paths. c. (0.59kg, 111.4°c, 73%, 0.4307kg, 0.1 593kg, 2.11 bar, 121.84°c)