Ah you're right, sorry about that. That post is really interesting. I know ggplot2 does quite a bit of it, but the visualizations are really nice. You mention

Ah you're right, sorry about that. That post is really interesting. I know ggplot2 does quite a bit of it, but the visualizations are really nice. You mention significance a few times but I don't see alpha levels or significance testing per se; do you mean significant in the casual sense, or are you just withholding the stats talk for the audience of (most likely) laypeople? If it's the former, you might find statistical significance in even the avg % grade by gender, given a large enough sample size. I might be overlooking the part where you talk about this, and I apologize if that's the case.