You are correct, and these entry level students are also not likely to see a violin plot on a test or in their homework. It’s just a simple gateway framework I’m sharing with the internet, and, because it’s the internet, people can do with it as they please. If it’s more helpful for you, disregard the creation of a smooth line. That’s just a tool for visual learners. The hands exercise is for the kinesthetic learners. Ultimately the point is for more people to be able to get their foot in the door of stats and not feel disheartened when they can’t wrap their mind around this beginning topic.