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Sex Differences in Mathematics components of the Iowa tests of Basic Skills

The Mathematics Problem Solving (MPS) and Mathematics Concepts (MC) subtests of the Iowa Tests of Basic Skills were investigated for content and psychometric item bias at grades 3, 6, and 8. A small proportion of items were identified in each subtest which significantly favored either males or females. No skill classification, item content or location trends could be found for the mathematics subtests at each grade level. Across the grade levels, items in the MC subtest favored males for grades 3 and 6, but females were favored at grade 8. The procedure used in the study is generalizable to other groups (minority or grade levels). Test consumers have the right to know whether the test they use is fair for selected groups of students. Results from empirical investigations should appear in the Test Manual that accompanies the test battery.