Problem
A professor at a community college wants to determine whether number of absences (x) is a useful linear predictor of the final grade for the course (y). The professor obtained the following least squares regression line: \[ y=-2.83 x+88.73 \] Interpret the slope of the line.
Solution
Step 1 ：The slope of the line, -2.83, indicates that for each additional absence, the final grade decreases by 2.83 points, on average, assuming all other factors are held constant.
