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Einkommen der Eltern versus Schulerfolg ...

„On both math and reading tests, students at the 90th percentile of the income distribution score about 1.3 standard deviations higher than students at the 10th percentile.“

Dr. Seth Gershenson, „Do Summer Time-Use Gaps Vary by Socioeconomic Status?“ in „American Educational Research Journal“, Dezember 2013, Vol. 50, No. 6, S. 1219