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A survey organization wants to estimate average household income in a large city. They divide the city into 500 neighborhoods (clusters), randomly select 20 neighborhoods, and survey every household in those 20 neighborhoods. What type of sampling is this, and what is the primary disadvantage?
A survey organization wants to estimate average household income in a large city. They divide the city into 500 neighborhoods (clusters), randomly select 20 neighborhoods, and survey every household in those 20 neighborhoods. What type of sampling is this, and what is the primary disadvantage?