Question 2 (10 marks; 18 minutes) cost estima A group of learners at the Military Academy's Accounting and Auditing (Mil) Department decided to conduct a survey to determine the correlation between hours studied by some of their students and the results obtained in the examination. Based on the results of the survey, the following values were calculated: Required: 2.1 2.2 2.3 2.4 CL n a b Ex Exy [x 10 0.97 9.08 0.33 1 361 545 85 945 220 505 33 843 Calculate the coefficient of determination and briefly discuss the significance thereof (be specific to the case above). (3) (3) Explain the significance of the a and b values in the regression equations. (2) Calculate an estimated percentage mark that a student can expect if he or she spends 170 hours on studying. Determine how many hours a student should study if he or she want to pass with a distinction, that is 75%. (2)