In this article we present the results of an investigation into semiotic aspects of an introductory differential equations class from two countries. In order to perform a comparative analysis, students in the USA and Tunisia were given common questions on their midterm exams that examined analytical and graphical competencies. Our results indicate…

Over the past few decades, those who take tests in the United States have exhibited increasing diversity with respect to native language. Standard psychometric procedures for ensuring item and test fairness that have existed for some time were developed when test-taking groups were predominantly native English speakers. A better understanding of…

The major goal of this study is to apply the essential unidimensionality statistic of W. Stout and the corresponding computer program (DIMTEST) to a hierarchical level mathematics achievement data set and to determine the extent to which the undimensional assumption can be accurately applied to mathematics achievement data. The study also…