Question

If I conduct a research and choose for my sample whoever walks by the mall, that is an example of............ :

• A. Purposive sampling
• B. Snowball sampling
• C. Random sampling
• D. Convenience sampling

Hint:

Convenience sampling is fast and inexpensive, but it suffers from high selection bias.
The results cannot be generalized to the entire population because certain groups (e.g., people who do not visit malls) are completely excluded from the sample.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Sampling techniques are classified into probability and non-probability sampling methods.
In non-probability sampling, elements are selected from the population based on subjective criteria or accessibility rather than random mathematical chance.

Step 2: Detailed Explanation:
Let us analyze the selection process described in the question:
The researcher selects individuals for the study simply because they are walking by a specific mall.
This means the sample is chosen entirely based on who is easily accessible, nearby, and willing to participate at that particular time.
This is the definition of convenience sampling (also known as accidental, opportunity, or grab sampling).
Let us contrast this with the other options:
- Purposive sampling (A): The researcher uses their own judgment to choose individuals who represent a specific profile needed for the study.
- Snowball sampling (B): Existing participants recruit future participants from among their acquaintances, useful for hard-to-reach populations.
- Random sampling (C): A probability sampling method where every member of the population has a known, non-zero chance of selection, which is not true for people walking past a single mall.
Thus, the correct classification is convenience sampling.

Step 3: Final Answer:
The correct option is (D).