Which of the following is not a type of nonrandom sampling?

Which of the following is not a type of nonrandom sampling? (a) Cluster sampling

(b) Convenience sampling

(c) Quota sampling

(d) Purposive sampling

(e) They are all type of nonrandom sampling

✅ Correct option: (a) Cluster sampling

Explanation:

Cluster sampling is a random sampling technique, not a nonrandom one. In cluster sampling, the population is divided into clusters, and clusters are randomly selected. All or some members within selected clusters are then studied. Convenience, quota, and purposive sampling are all nonrandom methods because participants are selected based on accessibility, predetermined characteristics, or researcher judgment rather than random selection. Therefore, the correct answer is cluster sampling, option (a).

10 Related PPSC Facts:

Cluster sampling is random Uses random cluster selection Convenience sampling is nonrandom Quota sampling is nonrandom Purposive sampling is judgmental Random sampling supports generalization Nonrandom sampling increases bias Cluster sampling is cost-effective Used in large populations Common in educational surveys