A method of sampling in which the population is split into non-overlapping groups (the strata), with the groups having different characteristics that are known for the whole population. A simple random sample is taken from each stratum.
Consider obtaining a sample of students from a secondary school with students from Year 9 to Year 13. This year levels are suitable strata, and the simple random samples taken from each year level from the sample.
Curriculum achievement objectives references
Statistical investigation: Levels (7), (8)
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