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Non-Random Sampling Methods

Convenience, purposive, quota, snowball sampling.

Notes

Non-Random Sampling Methods

Class 11 Statistics — Judgement, Quota, and Convenience Sampling

Introduction to Non-Random Sampling

Non-Random Sampling
A method where the selection of a sample depends on the judgement and convenience of the investigator rather than on chance.

Key Takeaways

  • Does not provide every item in the universe with a known chance of being included.
  • If the investigator is unbiased and intelligent, the selected sample may be more representative than a random sample.
  • Not scientific — various laws of statistics cannot be used to analyse it.
  • Main methods: (i) Judgement Sampling, (ii) Quota Sampling, (iii) Convenience Sampling.

Three Methods of Non-Random Sampling