Sampling
Sampling Procedure
The sampling frame is based on the school annual census database. The sample is drawn using a stratified multi-stage cluster sampling design. The sample is stratified by province, district and location (urban and rural). In the first stage, a sample of schools is selected within each stratum using probability proportional to size. Schools with less than 20 learners at the targeted grade are excluded. In the second stage, students were selected at the targeted grade using systematic sampling.
Purposive sampling (a non-probability sampling) is used to select students with special educational needs.
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