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It is a form of non-probability sampling :

  • A.Simple random
  • B.Stratified random
  • C.Systematic
  • D.Purposive

Answer: D

The form of non-probability sampling is purposive sampling.

In non-probability sampling, units are chosen by the researcher's judgement or convenience, so not every unit has a known chance of selection. In purposive (judgement) sampling the researcher deliberately picks the cases thought most useful for the study.

Simple random, stratified random and systematic sampling are all probability methods: each gives every unit in the population a known, non-zero chance of being chosen.

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