por Basetsana Shela 5 anos atrás
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por Lisbeth Mishelle Avila Napa
por Nahomi Cuts
por Apichart Bunyapiradee
por Natanael Luffi
Cluster sampling -Groups identified within the population are heterogeneous -Each cluster stands an equal chance of being included in the sample -The sample was used to obtain a nationally representative sample of students in grades 8-10