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Originally Posted by kennyc
Unfortunately that study is almost 20 years old and given the changes in the last 20 years I don't think I'd put much faith in it for that reason alone.
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And the web page also said:
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Differences in state scores for students with similar families can be explained, in part, by per pupil expenditures and how these funds are allocated. States at the top of the heap generally have lower pupil-teacher ratios in lower grades, higher participation in public prekindergarten programs and a higher percentage of teachers who are satisfied with the resources they are provided for teaching. These three factors account for about two-thirds of the Texas-California differential. Teacher turnover also has a statistically significant effect on achievement. (California is now implementing class-size reduction and other reforms but these steps began after the 1996 NAEP tests.)
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No mention of any difference in being liberal causing the difference.