The U.S. Department of Education conducted a statistical analysis that combined the results of multiple scientific studies. One of the findings was that "instruction conducted entirely online is as effective as classroom instruction".
Means, Barbara & Toyama, Yukie & Murphy, Robert & Bakia, Marianne & Jones, Karla & and Policy Development USA. Dept of Education. Office of Planning, Evaluation. (2010). Evaluation of Evidence-Based Practices in Online Learning: A Meta-Analysis and Review of Online Learning Studies. www2.ed.gov/...pdf
A group of tenth grade students was taught via an online classroom, i.e., teacher and students were meeting through a webconference software, used online whiteboard etc. Another group of of tenth grade students was taught the same material through a traditional face to face class. Achievement was higher among the students of the online class than the face to face class.
Muntajeeb Ali Baig (2011). A Critical Study Of Effectiveness Of Online Learning On Students' Achievement. i-manager’s Journal of Educational Technology, 7(4), 28-34. https://doi.org/...1391