Psychology research methods

Key terms and definitions

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  • Created by: dominika
  • Created on: 03-03-12 22:14

Oppertunity Sampling

Members of the target population and are willing to help at the time of the sampling.

+ Quick and easy

- could be biased and not representative of target population

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Random Sampling

Every one from the target population has an equal chance of being picked for the sample.This can be done by e.g. picking out of a hat

+likely to be representative, no researcher bias

- Time consuming

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Systematic Sampling

Every 'nth' person from target population is picked to take part in the sample e.g. every 9th person in a register

+ simple, no researcher bias

- May not be a representative sample

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Stratified sample

Most complex method of sampling, different sub groups in the target population are identified and people are then randomly picked from these in proportion to the number of target population e.g 300 pupils -> 120 boys, 180 girls -> 30 boys and 45 girls 

+very representative

- very time-consuming

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