DC public schools have the highest per pupil spending, and the poorest result, in the nation, when compared to all other public school systems. For years they have been held up as kind of the poster child for the "funding doesn't matter" crowd. The truth is that DC public schools are an anomaly. They are the exception that is used to disprove the rule.
If you look at per pupil spending of the 50 states and compare it to the full range of school assessment measures - standardized testing scores, graduation rates, college metriculation, career success, etc. - there is a statistically significant correlation. It is, however, a very rough correlation, and there are some school systems that get better and worse bang for the buck. You can also cherry pick one or two data points in an attempt to disprove the rule. For example, SAT scores don't correlate much with spending, but other testing scores do. DC gets the worst bang for the buck of any school system in the U.S.
In California, our PPS in adjusted dollars was, if memory serves, 43rd in the country last year. And that is about where California schools rank overall in the U.S. In the 1970's, before Prop 13, when we had among the highest PPS, California schools were some of the best in the country.
The example of DC does show that there is a lot more to quality education than funding, however. There is no disputing that.
- wolf