Sampling

• How many sampling methods are there?

  • 8
• List all the sampling methods

  • Opportunity
  • Random
  • Systematic
  • Stratified
  • Quota
  • Snowball
  • Purposive
  • Cluster/Multistage
• Random Sampling

  • Each member of the population has an equal chance of being selected e.g names being picked out of a hat
• Systematic Sampling

  • Number of people are selected from the sampling frame at regular intervals e.g take the tenth name from the sampling frame
• Stratified Sampling

  • Divide the sampling frame into groups and take a certain sample from each
• Quota Sampling

  • Select people who fit into certain categories
• Multistage/Cluster Sampling

  • Certain areas are chosen and then random samples are taken in those areas e.g In a survey of school students, take a random sample of schools and then a random selection of students in those schools
• Snowball sampling

  • Identify a person that fits the category of the characteristics and ask them to introduce them to whoever fits that category e.g useful for difficult groups (criminals)
• Purposive Sampling

  • Sample selected according to known characteristics e.g MP, Headteacher
• Opportunity Sampling

  • Gathering data to anyone who is available