Operationalising Research

Random Sample

• Simple random sample
  
  
  • ideal: every member of the population has an equal chance of being selected
    
    
  • in practice: every member of the sampling frame has an equal chance
    
    
• Stratified random sample
  
  
  • organise sampling frame in terms of, for example, gender, ethnicity, ...
    
    
• Cluster sample
  
  
  • successive random samples at decreasing levels

from: theoretical sample