Sampling

• What is opportunity sampling?

  Asking whoever is available and willing
• Why is opportunity sampling considered convenient?

  It saves time and costs for researchers
• What is a major disadvantage of opportunity sampling?

  It may lead to biased and unrepresentative samples
• What is self-selected sampling also known as?

  Volunteer sampling
• How do participants become involved in self-selected sampling?

  They approach the researcher after seeing advertisements
• What is an advantage of self-selected sampling?

  Participants are likely motivated and interested
• What is a disadvantage of self-selected sampling?

  It may not represent the target population well
• What does systematic sampling involve?

  Selecting every nth person on a list
• How do you determine the value of n in systematic sampling?

  Divide population size by sample size
• What is an advantage of systematic sampling?

  It avoids bias from researcher preconceptions
• What is a disadvantage of systematic sampling?

  Participants may refuse to take part, reducing sample size
• What is random sampling?

  Every member has an equal chance of selection
• How can random samples be generated?

  Using a computer program or drawing names
• What is an advantage of random sampling?

  It reduces bias in sample selection
• What is a disadvantage of random sampling?

  Participants may not be available or refuse
• What does stratified sampling ensure?

  Aspects of the target population are reflected
• How is a stratified sample created?

  By randomly selecting from defined population segments
• What is an advantage of stratified sampling?

  It produces a more representative sample
• What is a disadvantage of stratified sampling?

  It is complex and time-consuming to implement