Which of the following is NOT a sampling method?

Qualitative sampling is not a traditional sampling method in the same context as the others listed. The options provided include specific techniques for selecting representative samples from a larger population, which are typically quantitative methods used in statistical analysis.

Random sampling, stratified random sampling, and cluster sampling are all systematic approaches that ensure a representative subset of a population is selected for research. Random sampling involves selecting individuals randomly to avoid bias. Stratified random sampling involves dividing the population into subgroups and then randomly sampling from each subgroup to ensure all are represented. Cluster sampling, on the other hand, involves dividing the population into clusters and then randomly selecting whole clusters for the study.

Qualitative sampling, while it is an essential process in qualitative research, does not fit into the same framework of systematic sampling methods aimed at statistical generalization. Instead, qualitative sampling focuses on selecting participants based on specific criteria relevant to the research question, which may not involve random selection at all. This distinction highlights why qualitative sampling is categorized differently from the other methods mentioned.