Experimental Design Details
The project/experiment is carried out in five stages: baseline survey, random grouping, intervention, mid-term monitoring and endline evaluation.
1. Baseline survey
The baseline survey is conducted in 200 primary schools in Northwestern China. The survey includes standardized English test for students and questionnaires for students, teachers, and school principals. Well-trained personnel are sent to rural schools to monitor standardized tests and help respondents answer survey questionnaires using school computers.
2. Random grouping
Following the baseline survey and English tests, schools are randomly assigned to one of the four groups: live instruction (treatment 1), pre-recorded instruction (treatment 2), teacher’s discretion (treatment 3) and control group. We stratify the randomization by county to improve power and use computer program to make sure the four groups are balanced over test score and key variables (collected in baseline survey).
3. Intervention
There are three treatment groups: live instruction, pre-recorded instruction and teacher’s discretion.
In the first two groups, every week students attend two classes instructed by long-distance teachers, either through dual-camera live broadcast or pre-recorded videos. Local teachers need help with class management during the instruction. They are also offered instructional materials including homework assignments, tutorials, and exams etc., and asked to use those materials after class. Project managers keep close tabs on teachers’ attendance and feedback records to ensure compliance.
In the teacher’s discretion group, local teachers are provided with pre-recorded videos, instruction slides, homework assignments, tutorials, and exams etc. Although they are highly recommended to use the materials, they have the discretion whether and how to use them.
4. Mid-term monitoring
After one semester of intervention, the research team dispatches personnel to selected schools with high degree of cooperation, average degree of cooperation and poor degree of cooperation to carry out qualitative interviews to understand the effect of the intervention and existing problems.
5. Evaluation
We conduct evaluation based on follow-up surveys. Similar test and questionnaires as in the baseline survey are given. The first follow-up will be conducted one year after the intervention to evaluate the impact of one-academic year’s intervention and we plan to carry out further follow-ups in 5 years to evaluate the long term effect.