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Dega, Bekele Gashe; Govender, Nadaraj – African Journal of Research in Mathematics, Science and Technology Education, 2016
This study compares the scientific and alternative conceptions of energy and momentum of university first-year science students in Ethiopia and the US. Written data were collected using the Energy and Momentum Conceptual Survey developed by Singh and Rosengrant. The Concentration Analysis statistical method was used for analysing the Ethiopian…
Descriptors: Foreign Countries, Comparative Education, Energy, Motion
Long, Caroline; Wendt, Heike – African Journal of Research in Mathematics, Science and Technology Education, 2017
South Africa participated in TIMSS from 1995 to 2015. Over these two decades, some positive changes have been reported on the aggregated mathematics performance patterns of South African learners. This paper focuses on the achievement patterns of South Africa's high-performing Grade 9 learners (n = 3378) in comparison with similar subsamples of…
Descriptors: Foreign Countries, Comparative Analysis, Multiplication, Comparative Education
Retief, Liezel; Potgieter, Marietjie; Lutz, Marietjie – African Journal of Research in Mathematics, Science and Technology Education, 2013
In this paper the use of the Rasch model is explored as a transparent, systematic and theoretically underpinned response to quality issues that are widely recognised as problematic in the refinement of Likert scale questionnaires. Key issues are the choice of length of scale, the pursuit of a favourable estimate of Cronbach's alpha at the possible…
Descriptors: Item Response Theory, Test Construction, Likert Scales, Questionnaires

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