Question: true or false 1. a negative intracluster correlation coefficient implies heterogenous units within a cluster 2. stratification will always yield efficiency gain over unstratified SRSWOR


true or false 1. a negative intracluster correlation coefficient implies heterogenous units within a cluster 2. stratification will always yield efficiency gain over unstratified SRSWOR in the same sample size 3. sampling weight allocates the number of population units being represented by sample unit
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