Criticism
NAEP's heavy use of statistical hypothesis testing has drawn some criticism related to interpretation of results. For example, the Nation's Report Card reported "Males Outperform Females at all Three Grades in 2005" as a result of science test scores of 100,000 students in each grade. Hyde and Linn criticized this claim, because the mean difference was only 4 out of 300 points, implying a small effect size and heavily overlapped distributions. They argue that "small differences in performance in the NAEP and other studies receive extensive publicity, reinforcing subtle, persistent, biases."
Read more about this topic: National Assessment Of Educational Progress
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