i've got questions about clustered-stratified random sampling.
let's say I want to do a research in narcotics.
the population that I will be working with is a combination of academics, students, and government employees (law enforcers, DEA, etc). I consider the population's unknown because I couldn't get the exact number of the population.
from that population, I'm thinking of clustering the population into two groups, those from academics and the practitioners (the government employees). From that clusters, I developed two levels,
the academic cluster contains lecturer group and students group. the practitioners group contains high-level group and low-level group.
Have I already clustered and stratified my sample in right manner?
How do I decide the exact sample for the cluster without knowing specific population of each group and without knowing total population?
and how do I decide the exact sample for each level of the cluster?
thank you very much, I appreciate your time and suggestions :)