Pros & Cons of Sampling

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  • Created by: Sophie
  • Created on: 21-03-13 18:12
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  • Pros & Cons of Sampling
    • Systematic
      • Should produce an unbiased sample, can be carried out by machine.
        • Nth item might coincide with a pattern, eg every 10th product is faulty, or without faults, which means there would be bias
    • Stratified
      • If you have easy-to-define categories, you'll get a representative sample.
        • Not useful when there are no obvious categories, and can be expensive.
    • Simple Random
      • Every member has an equal chance of being selected, so completely unbiased.
    • Quota
      • Quick and no sample frame is needed.
        • Can be easily biased as sample depends on the interviewer, and those who refuse to take part may have similar views on the topic
    • Cluster
      • Convenient, and can save on a lot of travel time if the population is spread over a large area,
        • Easily biased eg. everyone living in the same postal district could have similar incomes or employment.
    • Convenience
      • Done at a time and place which suits the interviewer, and a list of the whole population is not needed.
        • No attempt to make the sample representative so there's a massive risk of bias.
  • Done at a time and place which suits the interviewer, and a list of the whole population is not needed.
    • No attempt to make the sample representative so there's a massive risk of bias.

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