Sampling Methods

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  • Created by: Emily
  • Created on: 21-05-13 14:41
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  • Sampling Methods
    • Volunteer Sampling
      • Individuals who have chosen to take pert in the study - may have responded to an advert
      • ++ Quick and economical, common and informed consent already given
      • -- Unrepresentative only a certain type of people will put themselves forward, who will see the advert
    • Random sampling
      • aksing people in the street, pulling names out of a hat ect
      • ++ large samples provides unbiased results everyone has chances of selection
      • -- time consuming, too small sample leads to bias
    • Stratified and Quota Sampling
      • Diving the population into important sub categories then selecting 25% of those
      • ++ Representitive of the target population  - equal from subgroups
      • -- can be time consuming, has to be quite a large sample size
    • Systematic sampling
      • all participants in a list every 10th person is chosen
      • ++ unbiased system
      • -- if one person says no the whole system breaks down
  • Opportunity Sampling
    • Sampling Methods
      • Volunteer Sampling
        • Individuals who have chosen to take pert in the study - may have responded to an advert
        • ++ Quick and economical, common and informed consent already given
        • -- Unrepresentative only a certain type of people will put themselves forward, who will see the advert
      • Random sampling
        • aksing people in the street, pulling names out of a hat ect
        • ++ large samples provides unbiased results everyone has chances of selection
        • -- time consuming, too small sample leads to bias
      • Stratified and Quota Sampling
        • Diving the population into important sub categories then selecting 25% of those
        • ++ Representitive of the target population  - equal from subgroups
        • -- can be time consuming, has to be quite a large sample size
      • Systematic sampling
        • all participants in a list every 10th person is chosen
        • ++ unbiased system
        • -- if one person says no the whole system breaks down
    • Taking a sample from people who are available at the time. Stopping pupils in the corridor or going into a year 7 classroom
    • ++ convenient and ethical. Wide variety of ppts leading to a representative
    • -- Unrepesentitive samples can be bias as we are likely to choose helpful looking people. Only a subgroup of the target population
  • Sampling method
    • Sampling method description and eg
      • positives
      • negatives

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