Your logic doesn't work. Of those people who simply participated in the lottery, the ones who won it and went to charter school did better than the ones who wer

Your logic doesn't work. Of those people who simply participated in the lottery, the ones who won it and went to charter school did better than the ones who weren't selected and didn't. This means the groups being compared - the winners and losers - both "had active parents"; this factor does not constitute a difference between the two groups.