WHAT?!?!?! no variable or set of variables have yet to account for this discrepancy? Really? Why does unrefrigerated milk spoil sooner than refrigerated milk? Is there no variable or set of variables that would account for the obvious difference? Try this; Children growing up in fatherless homes, with little guidance or discipline tend to have less respect for authority, their peers, establishment rules or generally accepted social manners. They, therefore 1) Swear at teachers 2) Fight at school 3) vandalize property....
I'm no expert here. But I'd guess this study started with the results, "Black students are disciplined more because of racism."
They need to be disciplined more because they’re stupid.