4. A class contains about 150 students. Each student belongs to one of six different sections in the class. The class instructor computes the average scores on the rst two quizzes for each of the six sections. The correlation between these two sets of averages is very high: r=99%. The following scatterplot shows the averages with the regression line added in. C} N uni: If] H E O 3 II} $ 1 h D U m % Cd 5 D a 1- N E 3 O In 5 10 15 20 Quiz 1 average scores (points) The instmctor knows that for each quiz, the SDs of the scores within each section were about 3 points. Draw in your best guess for the regression line for all the students. (Don't worry about doing exact calculations; just think about where it will intersect the existing line and whether the slope will be steeper, the same, or less steep than the existing line.)