Which of the following is a non-probability sample?

AQuota sample

BSimple random sample

CPurposive sample

DBoth quota sample and purposive sample ✓ Correct

Correct answer: (D) Both quota sample and purposive sample

Explanation

Both quota sampling and purposive sampling are non-probability methods, so the two belong together.

Quota sampling alone is non-probability but naming it alone ignores the equally valid purposive option.

Simple random sampling is a probability method and cannot be the non-probability answer.

Purposive sampling alone is non-probability but again omits the equally valid quota option.

Non-probability methods do not give units a known chance of selection.

Their results cannot be safely generalized to the population through probability theory.

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