When preparing a representative sample from a list of 200 customers who complained about errors in their statements,a _____ could ensure the sample is balanced geographically by selecting five customers

When preparing a representative sample from a list of 200 customers who complained about errors in their statements,a _____ could ensure the sample is balanced geographically by selecting five customers from each of four zip codes.
A) systematic sample
B) stratified sample
C) random sample
D) comprehensive sample


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