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John wants to check if 200 different smartwatches are waterproof. He first separated them on the basis of brand and then randomly selected 30 samples.
John wants to check if 200 different smartwatches are waterproof. He first separated them on the basis of brand and then randomly selected 30 samples. Identify the type of sampling method and explain reasoning.
- Stratified
- Cluster
- Systematic
- Random
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