Academic performance of K-12 students in an online-learning environment for mathematics increased during the shutdown of schools in wake of the COVID-19 pandemic

• Markus Wolfgang Hermann Spitzer ,

  Roles Conceptualization, Data curation, Formal analysis, Visualization, Writing – original draft

  * E-mail: Markus.spitzer@psychologie.uni-freiburg.de

  Affiliation Albert-Ludwigs-Universität Freiburg, Freiburg, Germany

  https://orcid.org/0000-0001-6040-1939

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• Sebastian Musslick

  Roles Formal analysis, Supervision, Writing – review & editing

  Affiliation Princeton Neuroscience Institute, Princeton University, Princeton, NJ, United States of America

  https://orcid.org/0000-0002-8896-639X

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