21. A researcher interested in the study habits of college freshman calculated regression questions for the average number of hours a student spent playing video games each day (X) and his or her college GPA (Y). The regression equation for predicting the average number of hours spent playing video . games each day (X) from known college GPAs (Y) is X = - 0.278Y + 2.52 The regression equation for predicting college GPA (Y) from known average number of hours spent playing video games each day (X) is Y = - 2.786X + 9.686 a. If a student spends 4 hours each day playing video games, predict his/her college GPA. b. Given a college GPA of 3.1, predict how many hours a student would spend playing video games each day