Research Methods: Sampling

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Research Methods: Sampling

Key Concepts

  • Target Population - refers to all the people a researcher wishes to make a statement about.
  • To have a representative sample from the target population - a group who represent the target population in terms of characteristics such as age, IQ, social class, relevant experiences etc.
  • Having a representative sample gives the ability to generalise from the sample to the rest of the target population which increases population validity.
  • A sample that's not representative is biased and will have low population validity.

Random Sampling

  • Everyone in target population has an equal chance of being selected.
  • Every member of target population identified
  • A random sampling technique used to select sample (e.g manual selection: every name put onto separate pieces of paper and placed in


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