Q9. Suppose that sa researcher, using data on class size (CS) and average test scores from BUS 247 classes, estimates the OLS regression testscore = 526 CS.

a. A classroom has 21 students. The regressions prediction for that classrooms 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 regressions prediction for the change in the classroom average test score is __________(Round your response to two decimal places.)