SAMPLING!

• random sampling:

  • each member of population has an equal chance of being included
  • random number table to obtain points on a map
  • helps ensure data is unbiased
• systematic sampling:

  • observations taken at regular intervals
  • useful as it's efficient way to sample large population & ensure it represents entire population
• | stratified

  • population divided into groups based on characteristics
  • sample size is proportional to size of group
  • useful because it ensures each group is represented accurately in the sample; giving accurate conclusions