An Instructor Gives Weekly Tests in One Class and Just

Multiple Choice

An instructor gives weekly tests in one class and just one midterm exam to a second class and then compares performances of students in the two classes when they all take the same final exam. What is the dependent variable in this experiment?

A) the number of students in each class
B) the difficulty of the final exam
C) the number of tests given before the final exam
D) the students' scores on the final exam