Sampling techniques Flashcards
who is opportunity sampling most used by?
psychology Students
give three advantages of opportunity sampling?
- easy
- cheap
- quick
in what type of experiment does opportunity sampling have to be used?
In natural experiments
Name 3 disadvantages of opportunity sampling?
- creates a biased sample
- not representative sample
- people may decline to take part so could turn into a volunteer sample
How are volunteer samples often obtained?
Through adverts
what core study uses volunteer sample?
Milgram
3 advantages of volunteer sampling?
- quick
- easy
- can reach a wide variety of participants
1 disadvantage of volunteer sampling?
-The type of participants may not be representative as they could be more obedient or motivated
How is random sampling defined?
where every member of the target population has an equal chance of been chosen ‘all names in the college in a hat’
1 advantage of random sampling?
-is the best technique for providing an unbiased representative sample of the target population.
2 disadvantages of random sampling?
- very time consuming
- sometimes impossible to carry out if every ones names are needed for example
define stratified sampling?
classifying the population into categories and choosing a sample which consists of participants from each category in the same proportions of the populations .
1 strength of stratified sampling?
-sample should be very representative of the target population
1 weakness of stratified sampling?
-very time consuming
when is snowball sampling used?
When members of your target population are difficult to contact such as student taking illegal drugs.
