STA221 SAMPLING TECHNIQUES - I
3 Hours/Week, 3 Credits
Concept and scope of sampling, sampling versus census, steps of survey, questionnaire, pilot survey, sampling and non-sampling errors, bias and precision, determination of sample size, probability and non-probability sampling. Random sampling design: simple random sampling, stratified random sampling, systematic sampling, cluster sampling. Estimation of population total, mean, proportion and their standard errors. Ratio and regression methods of estimation, basic ideas of two stage, three stage and double sampling. PPS sampling: comparison with sampling with equal probabilities. Selection of clusters with equal probability and unequal probability with and without replacement. Non-random sampling: purposive sampling, judgement sampling, quota sampling, snowball sampling: merits, demerits and applications.