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Sampling form finite populations: population, sample, sampling units/ sampling Vrs. Census sampling and non-sampling errors, probability and non-probability sampling, sampling designs: simple random sampling WOR and WR. Method of drawing simple random sample. Determination of sample size. Stratified sampling, systematic sampling. Cluster sampling, multi-stage sampling. Estimation of population mean / total and standard error of estimates. Use of auxiliary information in sample surveys – ration, regression and product method of estimation. Comparison of efficiency, PPS method of estimation.