> 55% of MA students take the SAT, while only 2% of KS students take the test.

This makes me think an interesting metric would be total SAT points per 100k population.

If only 2% of Kansas students are taking the SAT, that's kind of shocking, actually. But maybe the state University there doesn't require it?

Likely it just means that college-bound students (which should be ~1/3 of young adults based off educational attainment levels in the US), strongly lean to taking the ACT.