Cards (4)

  • Stratified sampling - where the proportions of each group of a population are representated in the sample.
  • Advantage of stratified sampling:
    • fairly represents each group
  • Disadvantage of stratified sampling:
    • more time consuming / complicated
  • Stratified sampling sample frame:
    • obtain a list of elements and break into groups
    • calculate proportions: (group frequency / population size) x sample size
    • repeat for each group, rounding values
    • conduct a simple random sample for each group