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Ismah Ismah Department of Mathematics Education, Faculty of Science Education, Universitas Muhammadiyah Jakarta Indonesia
Erfiani Erfiani Department of Statistics, Faculty of Mathematics and Natural Sciences, IPB University, Bogor Indonesia
Aji Hamim Wigena Department of Statistics, Faculty of Mathematics and Natural Sciences, IPB University, Bogor Indonesia
Bagus Sartono Department of Statistics, Faculty of Mathematics and Natural Sciences, IPB University, Bogor Indonesia
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