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1. Sampling Methods WJEC 2. Random – each member of the target population has an equal chance of being selected <ul><li>Advantage – Not biased, therefore…
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  • 1. Sampling Methods WJEC
  • 2. Random – each member of the target population has an equal chance of being selected <ul><li>Advantage – Not biased, therefore selection is more likely to be representative </li></ul><ul><li>Disadvantage – Time consuming, e.g. putting names into a hat and then picking them out again </li></ul>
  • 3. Self selected – participants put themselves forward to take part In the study <ul><li>Advantage – Easy, cheap and quick, all that is needed is an Advertisement for participants </li></ul><ul><li>Disadvantage – Selected participants may not be representative as only certain people, e.g. the elderly, will volunteer </li></ul>
  • 4. Quota – (convenience sample) researcher selects the participants that he/she needs, e.g. 10 females <ul><li>Advantage – Accurate as researcher selects who he/she needs </li></ul><ul><li>Disadvantage – Sample may be biased as researcher selected them </li></ul>
  • 5. Opportunity – researcher selects whoever is available at the time <ul><li>Advantage – Quick and easy way of selecting participants </li></ul><ul><li>Disadvantage – Selected participants may not be representative outside research situation </li></ul>
  • 6. Systematic – participants are selected at fixed intervals e.g. every 5th <ul><li>Advantage – Not biased </li></ul><ul><li>Disadvantage – If one selected participant does not want to take part in the study, the whole system breaks down </li></ul>
  • 7. Stratified – grouping members of the population e.g. gender, age <ul><li>Advantage - Accurate as researcher selects who he/she needs </li></ul><ul><li>Disadvantage – Requires accurate information about the population which may be difficult or time consuming to obtain </li></ul>
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