Which of the following is NOT a type of stratified sampling?

Correct option is C

Non Probability Sampling is NOT a type of stratified sampling. Stratified sampling is a probability sampling technique where the population is divided into distinct subgroups (strata) and samples are drawn from each stratum, whereas non-probability sampling does not involve random selection.
Information Booster: Stratified sampling ensures that subgroups of a population are adequately represented, improving the precision of estimates. Types include proportionate sampling (samples from strata proportional to their population size), disproportionate sampling (samples not proportional), and optimum allocation sampling (allocating samples based on variance within strata). Non-probability sampling methods like convenience or purposive sampling do not use randomization and hence are not stratified.
Additional Knowledge:
· (a) Disproportionate Sampling: Involves sampling unequal proportions from strata to meet specific research goals.
· (b) Proportionate Sampling: Samples are taken in proportion to the size of each stratum.
· (d) Optimum Allocation Sampling: Samples are allocated based on variability and cost within strata to optimize precision.