How does class size reduction measure up to other common educational interventions in a cost-benefit analysis? (Wing Institute Data Mining)

Why is this question important? Given the limited resources that are available for the education of children, it is important to select interventions that have the greatest impact we can afford. Using Stuart Yeh’s effectiveness cost ratio formula, a rough comparison can be drawn comparing class size reduction with other educational interventions.

Citation: Yeh, S. S. (2007). The Cost-Effectiveness of Five Policies for Improving Student Achievement, American Journal of Evaluation, 28(4), 416-436.

Link: https://www.winginstitute.org/how-does-class-size