= 5 = 12 solve clear and neat with complete explanation steps

Q9. Suppose that sa researcher, using data on class size (CS) and average test scores from BUS 247 classes, estimates the OLS regression testscore = 541 - (a + B)CS. a. A classroom has 21 students. The regression's prediction for that classroom's average test score is (Round your response to two decimal places.) b. Last year a classroom had 18 students, and this year it has 22 students. The regression's prediction for the change in the classroom average test score is (Round your response to two decimal places.)