Assume that someone is conducting a single case study research on university governance, which focuses on five governance dimensions. While the university as an entity is the unit of analysis, s/he wants to collect data from the university level, middle level (college/faculty/school), and lower level (department or chair) leadership through interviews.
Assuming s/he is applying stratified purposive sampling, how can s/he determine the overall sample size and the sample size for each stratum? Here is the population.
Top (university level) leadership= 27
Middle level (college/faculty level)=19
Lower level (department/chair)=73
Thank you in advance