Scientific processes
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8 Terms
Random sampling
Picking out participants at random for a study
Opportunity sample
Picking out participants who are available and willing to take part in your study
Volunteer sample
Picking out participants who themselves volunteer to take part in the study
Systematic sampling
Lining up all participants and selecting every nth participant
Stratified sampling
Where your sample is representative of the target popn
Independent groups
when different participants are used in each condition of an experiment.
Repeated measures
when the same participants take part in every condition of the experiment.
Matched pairs
when different participants are used in each condition, but they are matched on important characteristics
Note 
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