Although online and paper participants did not differ significantly on the assessed variables and relationships, other systematic differences between groups may have affected the data. (academic.oup.com)
These findings are consistent with — but not definitive proof of — the argument that systematic differences in the schools attended by white and black children may explain the divergence in test scores. (educationnext.org)
An index of civic skills was created to test for systematic differences across the five types of schools. (educationnext.org)