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To determine monthly rental prices of apartment units in the San Francisco Bay area, you classify the apartments according to zip code and take a random sample from each of the zip code regions. What sampling method have you employed?aRandombConveniencecMulti-stagedStratifiedeClusterfSystematic

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Answer:  Choice D) Stratified

Explanation:

This type of sampling is where you break the data into groups where there isn't any overlap. Then you select samples from each group. You may select the same amount from each group, or perhaps you select the items based on a weighted proportion. Note how one entire group is not sampled.

Contrast this with cluster sampling where again the data is broken into non-overlapping groups; however, this time we only select a few groups to sample every member of those groups selected. This time entire full groups are sampled.

Here's an example of each

  • Consider the 50 states as each group. If we randomly select 10 people from each state (perhaps based on their state of birth), then we are conducting stratified sampling.
  • If instead we randomly select 5 states, and sample every person in those states selected, then we are doing cluster sampling.

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