Library factor was a strong predictor of U.S. History scores

At the high school level, the library factor accounted for 19% of the variance in English Language Arts CST scores and 21% of the variance in U.S. History CST scores. In both cases, Beta weights indicated that the library factor was a stronger predictor of scores than other school variable; in fact, the library factor was stronger than either school or community factors in predicting U.S. History CST scores.