3.5 In a study relating college grade point average to time spent in various activities, you distribute a survey to several students. The students are asked how many hours they spend each week in four activities: studying, sleeping, working, and leisure. Any activity is put into one of the four categories, so that for each student, the sum of hours in the four B+ Bstudy + B-sleep + Bwork + Bleisure + u, it make sense to hold sleep, work, and leisure fixed, while changing PRO R REVIEW Explain why this model violates Assumption MLR.3. (iii) How could you reformulate the model so that its parameters have a useful interpretation and it satisfies Assumption MLR.3?