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Prior knowledge has been known to play a large role in the performance of students in learning environments. Using the virtual learning environment “Mathe im Advent” (MiA), we have analyzed possibly influential factors for the persistence of students, specifically prior mathematical and language abilities. MiA is a German virtual Advent calendar offering 24 daily mathematical tasks in December with over 100,000 users annually. During the COVID-19 pandemic, they extended their offers. Connecting the user data, linguistic features of the tasks and survey results of 2017, 2018 and 2019, we have examined the connection between prior knowledge and the performance of students. The result of the examination is that persistence, success, and the reparticipation of students strongly depended on prior mathematical knowledge and language abilities. This effect was especially visible when the language of the tasks was difficult and their readability was low.