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. Question 9 4 pts For each student, the researcher has data on the Fall semester GPA (GPA), the treatment X (equals to 1 if the students is lent a laptop, and 0 otherwise), and pretreatment characteristics FEMALE (equals to 1 if the student is a female, and 0 if male), and INCOME (monthly family income in dollars) The researcher estimates the following regression by OLS: GPA; = Bo + BiX; + B2 FEMALE; + B3INCOME; + Uj Inow that lantons are randomly lent to Question 12 4 pts 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 because of family relocation. The problem that some participants drop out of the study after being randomly assigned to the treatment or control group is known as: O failure to randomize o attrition O partial compliance O experimental effects 4 pts