Dog happiness
Body:
Find average dog happiness, and the happiest and saddest dogs.
(If you were logged in as a student, you could submit an exercise solution, and get some feedback.)
Do-Loop
Exercises and grades
Body:
Compare average exam scores for people who submitted many exercises to average scores for people who submitted fewer exercises.
(If you were logged in as a student, you could submit an exercise solution, and get some feedback.)