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Bias in sampling methods

Bias in sampling methods

Samples need to be representative of the larger population. It is important to identify when bias may be introduced through various sampling methods.

Bias can be introduced by:

  • relying on samples made up of volunteer respondents
  • sampling from select groups within a population, without including the same proportion from all the groups in the population
  • sampling from what is readily available
  • selecting a sample that is too small in relation to the bigger population
  • selecting a sample that is not generated randomly
  • selecting a sample that is not representative of the bigger population.

Strategies to select samples need to take into consideration the purpose of the information. For example, when seeking information to help select equipment for a new gym, it may not be appropriate to ask members of the school band.

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Name Class Section
Document Year 8: Investigate techniques for collecting data, including census, sampling and observation Infobox 3
Document Year 8: Explore the practicalities and implications of obtaining data through sampling using a variety of investigative processes Infobox 3
Document Source Infobox 3