Question 2- MBA Graduate Salaries (3 parts, 15 marks) Assign2.xlsx in dataset MBA_Salary contains the annual salaries, in thousands of dollars, earned by individuals who graduated with MBAs in 2015 and 2016 from a certain business school in Canada. We would like to determine whether the distribution of salaries for 2015 MBA graduates is higher than for 2016 MBA graduates.

a) [5 Marks] establish a boxplot and compare the distribution of salaries for 2015 and 2016 graduates.

b) [8 Marks] Perform the appropriate non-parametric test at a 5% significance level to determine whether the salary for 2015 graduates is higher than for 2016 graduates. State the hypotheses clearly and show your manual calculation for all the relevant steps in the test.

c) [2 Marks] Use Excel to perform the appropriate non-parametric test in part (b). How does the result from Excel compare with your conclusion in part (b).