Investigating effects of teachers in flipped classroom: a randomized controlled trial study of classroom level heterogeneity

Table 1 Overview of intervention

	Control	Treatment
Lectures
Before class	Textbook readings	Textbook readings
In class	Large class lecture: 90 min per week	Large class lecture: 90 min per week
Tutorial classes
Before class	Prepare problem set*
In class	Students listen and ask questions, while teacher explains problem set. Teacher gives a "mini lecture"	Students participate in group work on problem set. Teacher acts as a facilitator
After class		Students get access to video solutions of problem sets
Exam
	4 h closed book exam	4 h closed book exam

*Although students in the control classes were expected to prepare before class, many students showed up to the tutorial class without preparing