The variables in our dataset include the college grade point average (colGPA), high school GPA (hsGPA), and achievement test score (ACT) for a sample of 141 students from a large university; both college and high school GPAs are on a four-point scale. We estimate the following model by OLS: colGPA=B+BahsGPA+B ACT+u, and obtain the following parameter estimates B=1, B=0.5, and B.-0.02. Predict difference of college GPA's of two students (colGPAB-colGPAA) where the student B has a 0.4 higher GPA in high school and 5 points higher ACT score compared to student A. O a.0.20 O b.0.30 OC. 0.15 O d. 0,25

The varabies in our dataset include the college grade point average icolGPAL high shool GPA shsGPA) and achevement test score (ACD) for a sample of 141 student fram a large. unlversity, both college and high schoot GPAs are on a four-point scale. We estimate the tollowng model by Ots: colchAipitthisGPA+BACT+u, high school and 5 points hegher ACT score compared to student A. a. 0.20 b. 030 40.15 d.0.25