A researcher studying voter intentions believes that men and women may differ markedly in their views. Rather than take a single SRS, she draws an SRS within each gender and combines results.
What is the main statistical advantage of stratifying here?
- A
Eliminates response bias
- B
Eliminates undercoverage
- Ccheck_circle
Reduces variability in the estimate when strata differ
- D
Allows generalization to non-voters
Explanation
Stratification reduces sampling variability when strata differ from each other but are homogeneous within. It does not address bias or coverage issues directly.