Reflect on your understanding by working through these review questions.

1. Outline the steps involved in drawing up the following types of sample:
   
   • Simple random sample
   • Stratified sample
   • Cluster sample
   • Multi-stage cluster sample
   • Quota sample
   • Snowball sample
   • Volunteer sample
   • Maximum variation sample
   • Theoretical sample
2. What is the difference between probability and non-probability sampling? When is each approach useful?
3. What is the purpose of purposive sampling and when should you decide you have done enough of it?