Questions 9-15 Laptop access and GPA. Based on a random sample of 500 high-school students without laptops, a non-profit organization randomly lends laptops to 250 of them for the fall semester. A researcher wants to investigate whether being lent a laptop affects a student's grades, and collects data on the students' GPA for the Fall semester.D Question 13 7.5 pts Part 1 At the end of the semester, researchers tried to collect the semester GPA of the 500 high school students who participated in the experiment. However, they were not able to gather GPA for some students because they transferred to another school in the middle of the semester. The problem that some participants drop out of the study after being randomly assigned to the treatment or control group is known as: [ Select ] Part 2 If students who were not lent laptops were more likely to transfer to another school because the other schools provided laptops and more resources to all the students, then the OLS estimator B, is: [ Select ]