Procrastination and Performance

Figure below shows the average performance  of students having a certain PI. In the next figure, the size of the bubble gives an indication of  number of students having that PI.
 
We anticipate that as students have a more and more tendency to procrastinate, their performance in the class will be lower as well. We found the Pearson correlation of the procrastination index of the 106 K students to their performance in class to see the (correlational) impact of procrastination  on the student's performance.  The value of correlation is -0.60 and is statistically significant at p=0.001.  The performance in the course is significantly negatively correlated to the number of assignments started late or not submitted at all. The following figure shows procrastination index to the average performance in class of the students with that procrastination index. The size shows the number of students in that group, and the color shows the performance again visually. So at the bottom right we have our students whose Procrastination Index is close to 1.0 and the performance is less than 40. On the other end are students who have started all the assignments on time. Thus, top left represents students whose final score was close to 100 .