Nursing students at DUSON were administered a knowledge test regarding diabetes prevention and management at the end of the semester. One group (n=30) was randomly selected from nursing students who attended a supplemental and intensive educational workshop on this topic. The second group (n=30) was randomly selected from nursing students who received a general overview of the topic in their coursework, but did not attend the workshop. The total correct on the knowledge test was calculated for each student. An independent t-test was conducted. Which of the following best describes the study design? [Important consideration: The students evaluated for this project were randomly selected from each group, and not randomly assigned to one of the two groups] Non-experimental Quasi-experimental Experimental Randomized controlled trial