A statistics professor finds that he can predict a student's grade on the final exam based on the number of classes the student attended over the course of the semester. What can the professor say about the causal relationship between these two variables? A. The relationship likely is the result of some third variable that accounts for both a student's attendance in class and performance on the exam. 8. Students who do well on exams come to class because they enjoy the material. C. Attendance in classes causes students to understand the material and do well on the exams. D. We cannot say anything definitive about the causal relationships