Sampling

• What do researchers need to study a population?

  A sample of people
• What is the term for the group of people that can participate in research?

  Survey population
• Why do researchers need a smaller group to study?

  To make it more manageable
• What is the smaller group studied called?

  Sample
• What is an individual within the sample referred to as?

  Sampling unit
• What happens when a sample member leaves the study?

  It is called sample attrition
• What is a representative sample?

  A sample that reflects the wider group
• What is a non-representative sample?

  A sample that does not reflect the wider group
• What is the first sampling technique mentioned?

  Random sample
• How is a random sample selected?

  Using a sampling frame at random
• What is systematic sampling?

  Selecting every nth person from a list
• What does stratified sampling involve?

  Organizing the population into strata
• What is the goal of stratified sampling?

  To ensure the sample is proportional
• What does multi-stage sampling combine?

  Multiple sampling approaches
• What is a volunteer sample?

  A sample where participants volunteer to join
• Why might a volunteer sample be unrepresentative?

  Participants may have specific motives
• What is quota sampling?

  A method where a specific number is needed
• Why might quota sampling be unrepresentative?

  It often selects people from a similar area
• What is snowball sampling?

  A method where participants refer others
• Why can snowball sampling lead to unrepresentative samples?

  Participants may share similar traits
• What is a deliberately non-representative sample?

  A sample chosen for a specific reason
• Why might a researcher choose a non-representative sample?

  To focus on a specific characteristic