The goal is to select a sample that will adequately represent the population, so that what is described in the sample will also be true of the population. Population is the group whether individuals, objects, or events that the sample size is selected from. Disproportional stratified sampling takes the same number of subjects from each stratum, regardless of the percentage of subjects from each stratum in the population. Cluster sampling involves the random selection of naturally occurring groups or areas and then the selection of individual elements from the chosen groups or areas. Nonprobability A nonprobability sample is one in which the probability of including population elements are unknown.
Qualitative studies use nonprobability sampling exclusively.
In purposive sampling the researcher selects particular individuals or cases because they will be particularly informative about the topic. Dr. Dan all rights reserved.