To test whether extracurricular activity is a good predictor of college success, a college administrator records whether students participated in extracurricular activities during high school and their subsequent college freshman gpa. extracurricular activity college freshman gpa yes 3.51 yes 3.35 yes 3.96 yes 3.69 no 3.00 no 3.79 no 3.41 no 2.74 no 3.86 no 2.82 (a) code the dichotomous variable and then compute a point-biserial correlation coefficient.