To assess the extent of the housing downturn, in 2009 the Federal Department of

Question

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: A. Multistage sampling B. Convenience sampling C. Cluster sampling D. Systematic sampling E. Stratified sampling F. None of the above

Explanation / Answer

Multi-stage sampling (also known as multi-stage cluster sampling) is a more complex form of cluster sampling which contains two or more stages in sample selection.

Sampling methods are used to select a sample from within a general population. Proper sampling methods are important for eliminating bias in the selection process. Common methods of sampling include simple random sampling (completely random selection from the population), systematic sampling (ordering the population and selecting at regular intervals), stratified sampling (splitting the population into categories and randomly selecting from within each category), Convenience sampling is a type of sampling where the first available primary data source will be used for the research without additional requirements Convenience sampling refers to the non probability process by which a scientist gathers statistical data from the population, so here it is not the case.

so Answer would be stratified sampling, systematic sampling, Multi-stage sampling, cluster sampling

ans:- A, C, D, E

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