🏘️In a village with 5 wards, you are to select 2 wards and then 10 households from each. What sampling design is this?

🏘️In a village with 5 wards, you are to select 2 wards and then 10 households from each. What sampling design is this?

Answer: This is a Two-Stage Sampling Design (a specific form of Multistage Sampling).

Explanation:

• Stage 1 (Primary Stage): Select 2 wards out of 5 using Simple Random Sampling Without Replacement (SRSWOR). Each ward acts as a Primary Sampling Unit (PSU).

• Stage 2 (Secondary Stage): Within each selected ward, list all households and select 10 households by Simple Random Sampling. These are Secondary Sampling Units (SSUs).

Estimator for Overall Mean

Advantages:

• Feasible when complete household list of the entire village is unavailable.

• Reduces cost and fieldwork.

• Allows analysis at both ward and household levels.

  
  

Cross-Question: 👉 Why not sample all 5 wards?

→ Because of budget/time constraints. Two well-chosen wards can still provide reliable estimates if design weights are used properly.

ISS Example:In NSS rural employment surveys, villages are divided into blocks (like wards), and households are sampled in multiple stages exactly like this.