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Which of the following is not a non-parametric sampling ?

  • A.Judgmental sampling
  • B.Convenience sampling
  • C.Stratified sampling
  • D.Quota sampling

Answer: C

The one that is not non-parametric (non-probability) sampling is Stratified sampling.

Stratified sampling is a probability method: the population is divided into strata and a random sample is drawn from each, so every unit has a known chance of selection.

Judgmental (purposive), convenience and quota sampling choose units by the researcher's judgment or by ease of access, without random selection, so they are non-probability methods. Quota sampling looks like stratified sampling but fills the quotas non-randomly.

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