What is random sampling?
Every member or the target has an equal chance of being selected
Strength and weakness of random sampling
+ equal chance- no bias
- take a long time
What is systematic sampling?
Every nth member of the target population is selected
Strength and weakness of systematic sampling
+ avoids researcher bias
- unrepresentative sample
What is stratified sampling?
Sample is a proportional representation of the target population
Strength and weakness of stratified sampling
+ equal representation
- very time consuming and difficult
What is opportunity sampling?
The sampler selects participants from whoever is available at the time
Strength and weakness of opportunity sampling
+ easy and quick
- less representative only uses small section of the population
What is volunteer sampling?
Participants put themselves forward to be put into the sample
Strength and weakness of volunteer sampling
+ quite easy to do
- volunteers are more willing and eager