по Basetsana Shela 5 лет назад
207
Больше похоже на это
от Anna Schroff
от Arrieta Rodriguez Irving Raúl
от Erika Mishel
от Vidhya Iyer - T L Kennedy SS (2352)
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