Annual values for the adjusted closing share price of AerCap are as follows: (a.) Calculate the corresponding series of log returns. Calculate the mean, standard deviation and skewness of the return series. [9 marks] (b.) Calculate the test statistic to test if the mean return is statistically greater than 15%. [5 marks] (c.) What statistical tables should be used to find the critical value for this test and why are these tables used? [2 marks] (d.) Using the appropriate statistical tables, what is the critical statistic for this test at the 95% confidence level. Based on this, is the mean return statistically greater than 15% ? [4 marks] Annual values for the adjusted closing share price of AerCap are as follows: (a.) Calculate the corresponding series of log returns. Calculate the mean, standard deviation and skewness of the return series. [9 marks] (b.) Calculate the test statistic to test if the mean return is statistically greater than 15%. [5 marks] (c.) What statistical tables should be used to find the critical value for this test and why are these tables used? [2 marks] (d.) Using the appropriate statistical tables, what is the critical statistic for this test at the 95% confidence level. Based on this, is the mean return statistically greater than 15% ? [4 marks]