Sampling

• What is random sampling?

  -All members of a target population have an equal chance of being selected

  -E.G using random number generator
• What is a strength of random sampling?

  -Avoid bias
• What is a weakness of random sampling? -

  -Time consuming

  -May still be unreprensentative
• What is systematic sampling?

  -When every nth member of target population is selected
• What is a strength of systematic sampling?

  -It is unbiased
• What is weakness of systematic sampling?

  -Difficult to achieve

  -Time consuming
• What is stratified sampling?

  -Dividing population into subgroups, then selecting a sample from each of these groups, so the sample reflects proportion of certain characteristics in target population
• What is a strength of stratified sampling?

  -Representative so more generalisable
• What is a weakness of stratified sampling?

  -Very time consuming
• What is opportunity sampling ?

  -Taking the sample from people who are available at the time
• What is a strength of opportunity sampling?

  -Quick and easy
• What is a weakness of opportunity sampling?

  -Researcher bias
• What is volunteer sampling?

  -Ppts select themselves to be part of the sample
• What is strength of volunteer sampling?

  -Less time consuming
• What is a weakness of volunteer sampling?

  -Volunteer bias