Sampling methods

Part of research methods AQA course

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SAMPLING

  • Aim to have no more than 100 participants and generalise them to the who population or it will be time consuming and expensive


  • Sample should come from the target population and should be representative and not biased
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RANDOM SAMPLING

  • Every member of the target population has an equal chance of being selected. EG taking names out of a hat

Strength

Has the best chance of being an unbiased sample

Weakness

Compiling a list of everyone in the target population is timeconsuming and expensive

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OPPORTUNITY SAMPLING

  • This is where the researcher uses to partipants availible to him/her

Strength

Convenient and economic

Weakness

Can be unrepresentative so often biased

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VOLUNTEER SAMPLING

  • This is where participants self-select: they volunteer themselves

Strength

Convenient as it doesn't take much time for the researcher, just needing to compile an advert

Weakness

Unrepresentative as volunteers are often a particular type of person, so biased.

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