>>Do you know what a generalization is?<<
Yes, and generalizations based on an insufficient (or in your case unknown) number of representative samples is a logical fallacy.
I am not presenting a paper here. Public school performance is absymal in this country. We keep spending more money per kid and all national testing results and graduation rates show less and less results.
You know this and everyone else does too. The generalization holds because the people in the classrooms are the teachers. The results we have kids who are dumber than ever, are taught what to think mre now than how to think, and are incredibly proud and have high self esteem even though they are the worst prepared kids than ever before.