If I run an experiment with my class assigning half of the class to submit detailed notes based on the textbook, while the other half does not have to do so. I find at the end of the class that those who turned in notes achieved higher grades, and that this difference was statistically significant. What threshold can one draw for practical significance here? That is, how much higher would the note-taking students have to score for me to consider assigning this method for all future students in the course?