sampling methods

• What is the purpose of sampling in a study?

  To control effects of bias
• What is the target population?

  The group of people being studied
• Why should a sample represent the target population?

  To make valid generalisations
• What is the aim of sampling methods?

  To avoid bias in the study
• What is random sampling?

  Each person has an equal chance of selection
• How is random sampling conducted?

  Using numbers in a hat or random generator
• What is opportunity sampling?

  Selecting people who are available
• What is systematic sampling?

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

  Selecting participants in proportion to frequency
• What is a key advantage of stratified sampling?

  No bias as everyone has an equal chance
• What is a disadvantage of stratified sampling?

  It is time-consuming to sort sub-groups
• What is a benefit of opportunity sampling?

  It is quick and therefore cheap
• What is a limitation of opportunity sampling?

  It may end up with an unrepresentative sample
• What is a disadvantage of random sampling?

  It requires a complete list of the population
• How does systematic sampling differ from random sampling?

  Systematic sampling selects every nth person
• What is a key characteristic of stratified sampling?

  Participants are selected in proportion to frequency
• What is a potential issue with stratified sampling?

  It can be very time-consuming
• What does it mean for a sample to be unrepresentative?

  It does not accurately reflect the target population
• How does opportunity sampling avoid researcher bias?

  Participants are chosen based on availability
• What is the main goal of sampling methods?

  To ensure accurate representation of the population