Figure 3: Percentage of the video coverage by cohort (Pre-activity, Post-activity, and Pre-exam)3.2 Learning OutcomeTo help determine whether long or short-length videos were more effective, we also measuredstudents’ performance on in-video quizzes throughout the semester. The same quiz was given toboth groups. We continued using EQ 1 to determine which cohort students qualified for, and thecohort sizes were adjusted to reflect the earliest time period in which students watched the videos.In other words, now students only appear in one cohort. Figure 4 shows the percentage of studentswho took the video quiz in parenthesis for each cohort and the average percent scored for eachcohort on the x-axis. For the short group, the video quiz was at the