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Basic Concepts of Sampling
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actual approximately areas average bias biases boundaries Census cluster sampling coefficient of variation correlation cost counties covariance denotes duplicate element sampling element variance example factor formulas frame Hence increase interval interviews Listing Sheet mean square error measures methods multistage sampling noncoverage nonresponse number of dwellings number of elements obtain optimum allocation overall overlap paired selections percent population value primary selections primary units probability sampling problems procedures proportion proportionate sampling random numbers random selection ratio mean reduce replacement represent response sample blocks sample design sample dwellings sample mean sampling distribution sampling fraction sampling rates sampling units segments selection probability separate simple random sample situations sizes specific stage standard error statistics strata stratified sample stratum subclasses subsample survey systematic sample systematic selection U.S. Census Bureau unbiased estimate unequal clusters unit variance variable errors weights yield zone