I have 2 classes. Class #1 takes a pretest and then a posttest on a topic. Class #2, on the same topic, also takes a pretest and a posttest. However Class #2 also watches videos about the topic. I want to test whether there is a significant difference between the two classes of students as it relates to the results of the pretest and posttest scores.
What test for significance can I use?
What test for significance can I use?