Sampling Techniques

Eleanor Matthewman
Mind Map by Eleanor Matthewman, updated more than 1 year ago
Eleanor Matthewman
Created by Eleanor Matthewman over 6 years ago


IB Psychology (Research Methods) Mind Map on Sampling Techniques, created by Eleanor Matthewman on 07/22/2013.

Resource summary

Sampling Techniques
1 Random sampling- where every member of the target population has an equal chance of being selected
1.1 Best technique for providing an unbiased representative sample of the target population
1.2 Very time consuming and often impossible with a large target population
1.3 eg pulling names out of a hat
2 Opportunity sample- using anyone is the target population who is available
2.1 Quick and cheap
2.2 As it only uses people who are available at this time, the sample may not be representative
2.3 eg everyone in café 6
3 Systematic sample- selects pps at fixed intervals
3.1 eg every 10th person in the list of the target population
3.2 fairly cheap and fast
3.3 eliminates possibility of bias
3.4 researchers need to ensure that there are no hidden bias
4 Stratified sample- a proportional sampel
4.1 eg if 70% of the target population were male and 30% were female, your sample needs to be 70% male and 30% female
4.2 provides a very representative sample
4.3 Time consuming and expensive
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