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Question 1. (3 points) Imagine that a school manager wants to evaluate the success of students and therefore visits a classroom to ask several questions. He very much believes that attending classes positively a§ects the grades. So he has in his mind the following relation where he expects that  > 0:

where gradei is the Önal exam score of student i and attni is the number of hours attended by student i in classes.

(a) SLR 1: The population model is linear in parameters. 

(b) SLR 2: The sample is selected randomly from the population. (Hint: what kind of students would be attending the classes?) 

(c) SLR 3: The error has zero conditional mean, i:e: E("jattn) = 0. (Hint: what would make this assumption fail?)