I had that class in HS. Or at least I had a general statistics class where the teacher emphasized interpreting results, common fallacies, etc. As one might expect, the students didn't pay attention to anything other than memorizing the formulas and spitting them back out on the test. They then promptly forgot the formulas the memorized. I took the optional follow up class as an elective. Even amongst the students of that class, who were interested enough in statistics to take a more advanced one as an elective, all of us had to re-learn the formulas we forgot.

My point is, I know it's simple to notice a problem in society and think that the obvious solution is to make it required learning, but it won't stick unless its reinforced over and over again. It can't just be a class, it has to be reiterated in various forms throughout many classes.