jonka Basetsana Shela 6 vuotta sitten
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luonut Chris Castellanos
luonut Lisbeth Mishelle Avila Napa
luonut Briana I
luonut Heidi Stubbs
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