To Draw or Not to Draw? Examining the Necessity of Problem Diagrams Using Massive Open Online Course Experiments.

Zhongzhou Chen, Neset Demirci, Youn-Jeng Choi, and David E. Pritchard Department of Physics, University of Central Florida, Orlando, Florida 32816, USA Department of Educational Studies in Psychology, Research Methodology & Counseling, University of Alabama, Tuscaloosa, Alabama 35487, USA Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA (Received 5 April 2016; published 17 February 2017)

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