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Mathematics, 16.07.2020 01:01 brae3648
A school has 300 eighth-grade students and 200 ninth-grade students. The secretary randomly selects 12 eighth-grade students and 8 ninth-grade students to obtain a sample of size 20. What kind of sampling is this?
Simple random sampling
Stratified random sampling
Systematic sampling
Convenience sampling
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A school has 300 eighth-grade students and 200 ninth-grade students. The secretary randomly selects...
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