sampling methods

• What is random sampling?

  It is a method where every individual has an equal chance of being selected.
• Why is random sampling important?


  It ensures that the sample is representative of the population.
• Give an example of random sampling.

  A lottery system.
• What is opportunistic sampling?

  It is when people volunteer in response to a call for participants.
• How does opportunistic sampling work?

  Participants respond to a call for volunteers, such as in a phone survey.
• What is volunteer sampling?

  It is when participants self-select to take part in a study.
• What is a key characteristic of volunteer sampling?

  Participants choose to participate on their own accord.
• Provide an example of volunteer sampling.

  Using a call for participants in a study.
• What is systematic sampling?

  It involves selecting every nth person from a list.
• How does systematic sampling differ from random sampling?

  Systematic sampling selects participants at regular intervals, while random sampling gives each individual an equal chance of selection.
• Give an example of systematic sampling.

  Selecting every tenth person from a list.
• Why is stratified sampling used?

  To ensure representation from different categories within the population.
• What is stratified sampling?

  It involves dividing the population into categories and selecting a percentage from each category.
• What is a key feature of stratified sampling?

  Each category receives the same percentage selection.
• What are locks in the context of sampling?

  They refer to factors that can affect the sampling process.
• How can an investigator affect sampling?

  The investigator's biases can influence participant selection.
• Why are ethical issues important in sampling?

  They ensure the rights and well-being of participants are protected.
• What are the types of sampling methods discussed?

  • Random sampling
  • Opportunistic sampling
  • Volunteer sampling
  • Systematic sampling
  • Stratified sampling
• What are the ethical considerations in sampling?

  • Protecting participant rights
  • Avoiding demand characteristics
  • Ensuring informed consent