Sampling Approaches

Question 1

Probability-based sampling procedures

Answer 1

• Random sample (even distribution)
• Stratified sample (20, 40, 40 - criteria)
• Cluster sample (select a few random units of population - e.g., 3 hospitals from 20 - and invite everyone to participate - useful when you don’t have a census list or good sampling frame)

Question 2

Nonprobability sampling procedures

Answer 2

• Convenience sampling
• Snowball sampling
• Self-selected feedback forms