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Sampling Designs

Sampling Designs. Simple Random Sample (SRS). Stratified Random Sample. Cluster Sample. Cluster Sample. Systematic Sample. Multistage Sample where you use multiple designs like doing a stratified then breaking each strata into clusters and doing a census on random clusters.

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Sampling Designs

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  1. Sampling Designs

  2. Simple Random Sample (SRS)

  3. Stratified Random Sample

  4. Cluster Sample

  5. Cluster Sample

  6. Systematic Sample

  7. Multistage Samplewhere you use multiple designs like doing a stratified then breaking each strata into clusters and doing a census on random clusters.

  8. Sometimes there are problems with a sample – these are called biases. Some are accidental and some not…

  9. Types of Biases: Voluntary response I Will ! I Will ! I Will !

  10. Types of Biases: Undercoverage

  11. Types of Biases: I WONT’T I WONT’T Nonresponse REFUSED REFUSED

  12. Types of Biases: Response Should wolfs be allowed in Yellowstone park where families vacation?

  13. Hoping to learn what issues may resonate with voters in the coming election, the campaign director for a mayoral candidate selects one block from each of the city’s election districts. Staff members go there and interview all the residents they can find. Identify the following as a team. Population b) population parameter Sampling frame d) the sample e) Sampling method f) potential biases

  14. State police set up a roadblock to estimate the percentage of cars with up-to-date registration, insurance, and safety inspection stickers. They usually find problems with about 10% of the cars they stop. Identify the following as a team. Population b) population parameter Sampling frame d) the sample e) Sampling method f) potential biases

  15. Do this one by yourself – go to the web worksheet “Individual lesson practice” (do not select the team one use the other) Dairy inspectors visit farms unannounced and take samples of the milk to test for contamination. If the milk is found to contain dirt, antibiotics, or other foreign matter, the milk will be destroyed and the farm reinspected until purity is restored. Identify the following. Population b) population parameter Sampling frame d) the sample e) Sampling method f) potential biases

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