surveyor wants to sample a city for the local Public Health Office in order to a

Question

surveyor wants to sample a city for the local Public Health Office in order to assess asthma rates annually. In order to get the best estimate for the project, the urveyor first decides to sample 2 of 15 census tracts, and then to sample 5 households from each tract. Assume there are only 10 households in each tract. The surveyor randomly assigns each tract in the city a number 01-15, and each household in each tract a number 01-10. Use the following random number table to select each tract, and then each household, continuing along the line: 058791 211403 098746 170528 086401 370614 097810 036418 340514 What kind of sampling strategy is this?

Explanation / Answer

Surveyor decided to sample 2 of 15 census trcts to sample 5 households from each tract.

So it is stratified random sampling

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