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true or false - 1. in systematic sampling, sample size will not necessarily affect efficiency of design-unbiased estimation 2. proportional allocation in stratified samples will

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true or false - 1. in systematic sampling, sample size will not necessarily affect efficiency of design-unbiased estimation 2. proportional allocation in stratified samples will generate gain in precision if at least stratum mean varies 3. clustering cuts efficiency of element sampling by half

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