Question:
Which of the following sampling technique uses auxiliary information at pre-selection stage?
Which of the following sampling technique uses auxiliary information at pre-selection stage?
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Think about which technique needs an auxiliary variable to build its groups before any unit is drawn.
Updated On: Jul 4, 2026
- Stratified random sampling
- Systematic sampling
- Cluster sampling
- Two-stage sampling
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The Correct Option is A
Solution and Explanation
Step 1: Understand the two stages at which auxiliary information can enter a sampling design. Auxiliary information (a variable related to the study variable, known in advance) can be used either at the pre-selection stage, before the sample is drawn, or at the post-selection (estimation) stage, after the sample values are observed, as in ratio and regression estimators.
Step 2: In stratified random sampling, the auxiliary variable (for example age group, region, income class) is used to divide the population into strata before any unit is selected. This directly uses auxiliary information at the pre-selection stage.
Step 3: Systematic sampling only needs a serial ordering of the population list, cluster sampling groups units based on natural or geographical proximity, and two-stage sampling selects first-stage units (often clusters) and then subsamples within them; none of these three inherently require an external auxiliary variable to build the design before selection.
Final Answer: Stratified random sampling uses auxiliary information at the pre-selection stage.
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