How is stratified sampling carried out?​

Correct option is B

Introduction

Stratified sampling is a probability sampling technique in which the population is first divided into homogeneous subgroups (strata) based on common characteristics, and then a random sample is drawn from each stratum.

Information Booster

(B) Dividing the population into homogeneous groups and selecting randomly from each group ✔ (Correct Answer)

Steps in stratified sampling:

1. Divide the population into homogeneous strata (e.g., age, gender, income, region).
2. Select samples randomly from each stratum.
3. The sample may be proportionate or equal depending on the study design.

This ensures that every subgroup is adequately represented.

✔ Correct Answer

Why the other options are incorrect?

(A) ✘

• Describes Simple Random Sampling (SRS).
• No stratification is involved.

(C) ✘

• Strata are not random groups; they are homogeneous groups based on known characteristics.
• Hence, this statement is incorrect.

(D) ✘

• Also describes Simple Random Sampling, where each unit is assigned a number and selected randomly.

Additional Knowledge

Types of Probability Sampling