Sampling Methods

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  • Sampling Methods
    • Stratified Sampling
      • The target population is divided into subgroups and a random sample is taken from these - it is representative of the population
      • Advantages: Representative of the population
      • Disadvantages: Time consuming to identify subgroups, select and contact participants
    • Random Sampling
      • All members of the target population stand equal chance of being selected
      • Advantages: unbiased; equal chance of selection
      • Disadvantages: Requires a sampling frame (list of people in target population; takes time to contact participants.
    • Opportunity Sampling
      • Selecting anyone who is available from the target population
      • Advantages: less time to locate people
      • Disadvantages: possibility of untrue representation of population
    • Self-Selecting Sampling
      • Participants volunteer to take part in study
      • Advantages: Variety of participants, possiblity of more true representation of population
      • Disadvantages:may be biased and only involve extremely motivated people
    • Systematic Sampling
      • Participants are selected from a list at fixed intervals
      • Advantages: Unbiased, selected from objective system
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