A US government researcher wants to select a sample of tax returns that will include returns from a variety of different income levels. He divides the set of all the different incomes shown on the forms into 10 non-overlapping ranges. Then he randomly selects 100 tax returns from each. Which of the following best describes the sampling scheme used in this example?

A US government researcher wants to select a sample of tax returns that will include returns from a variety of different income levels. He divides the set of all the different incomes shown on the forms into 10 non-overlapping ranges. Then he randomly selects 100 tax returns from each. Which of the following best describes the sampling scheme used in this example?

A US government researcher wants to select a sample of tax returns that will include returns from a variety of different income levels. He divides the set of all the different incomes shown on the forms into 10 non-overlapping ranges. Then he randomly selects 100 tax returns from each. Which of the following best describes the sampling scheme used in this example?



A) Simple random sampling 

B) Two-stage sampling 

C) Stratified random sampling

D) Convenience sampling

E) Cluster sampling



Answer: stratified random sampling


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