Psychology- Sampling

  • Created by: Daisymac
  • Created on: 16-01-19 16:17
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  • Sampling
    • What?
      • A sample is a group of people who take part in a research investigation.
    • Random sample
      • In which all members have an equal chance of being selected .
      • List of all people form target population and the names are assigned a number and the sample is generated through a lottery method
      • Strengths- free from researcher bias as they have no influence over who is selected and prevents them from choosing people who they think will support their hypothesis
      • Weaknesses- Time consuming as you have to get a full list of target population and is extremely difficult to obtain. May be unrepresentative and some may refuse to take part
    • Systematic sampling
      • When every nth member of a target population is selected. A sampling from is produced where there is a list of people in alphabetical order  and every , for example, 3rd person is picked
      • Strength- avoids researcher bias and is fairly representative
      • Weaknesses- same as random
    • Stratified sample
      • The composition of the sample reflects the proportions of people in certain sub groups within the population
      • Strengths- Avoids researcher bias. Highly representative and so generalisations are possible
      • Weaknesses- Stratification is not always perfect and so complete representation is not possible. Also VERY time consuming
    • Opportunity sampling
      • Researcher takes the chance to ask whoever is around at the time of their study
      • Strengths- Convenient. Saves time and effort.
      • Weaknesses- Unrepresentative as they are drawn from  very specific ares. Also there is researcher bias
    • Volunteer sample
      • Involves participants selecting themselves to be part of the sample
      • Strengths- easy and requires minimal input from the researcher.
      • Weaknesses- Volunteer bias as it may attract a certain profile of person


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