Problem
Suppose you are interested in evaluating the effect of providing chlorine tablets to treat drinking water on labor productivity. You set up and carry out a RCT in Zambian villages by randomly providing free chlorine tablets to half of the households.
Suppose 20% of Zambian population does not believe in the efficacy of chlorine tablets to treat drinking water and does not use it and 10% of Zambian population finds a way to obtain access to free chlorine tablets irrespective of their treatment status.
In the final survey, researchers observe a 25% increase in productivity in the treated group and 4% increase in productivity in the control group.
What is the Treatment Effect-on-the Treated (TOT)? Write your answer in 96 terms. You only need to write the number.