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To assess the extent of the housing downturn, in 2009 the Federal Department of Housing and Urban Development (HUD) obtained

To assess the extent of the housing downturn, in 2009 the Federal Department of Housing and Urban Development (HUD) obtained information on 5000 randomly-selected single-family houses nationwide. To obtain the sample, they first selected a simple random sample of 50 congressional districts (out of 436 in all). Then, within each district they took a simple random sample of 10 census tracts. Finally, within each census tract they took a simple random sample of 10 homes. The sampling methods used are examples of:

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