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(c) In a COVID-19 treatment research trial, 100 subjects were randomly selected from North America, 150 subjects were randomly selected from Africa, and 120 subjects

(c)In a COVID-19 treatment research trial, 100 subjects were randomly selected from North America, 150 subjects were randomly selected from Africa, and 120 subjects were randomly selected from Europe. This type of sampling is called:

  1. icluster
  2. iiconvenience
  3. iiisystematic
  4. ivstratified

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