Question: true or false 1. to ensure all distinct sample units in PPS, all units with very large size measures should be considered as certainty units

true or false 1. to ensure all distinct sample units in PPS, all units with very large size measures should be considered as certainty units 2. model-assisted estimation uses both the info provided by the sample and by the assumed model 3. the estimator in the linear systematic sampling is unbiased if there is a presence of linear trend
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