A population is divided into relevant subgroups and random sample selection is done from each of the subgroups. This is which type of sampling method?
Systematic random sampling
Stratified random sampling
Simple random sampling
Cluster sampling
- in stratified random sample, the sample is deliberately drawn in a systematic way so that each poion of the sample represents a corresponding strata of the universe. - this method is paicularly useful where one is interested in analysing the data by a ceain characteristic of the population. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:850
Biostatistics