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...Advanced research methods dr rosalyn m king professor types of sampling probability random each person in the universe has an equal being chosen for sample a d every collection persons ofthe saine becoining actual simple without replacement systematic constructed by selecting kth element frame is more practical that it less work and thus provides information per dollar also may reduce error complex method greater opportunity stratified obtained separating population elements into overlapping groups called strata then from within stratum example rank order full associate etc after this done or drawn group cluster which unit investigator wishing to study students might first clusters such as classes dormitories select fmal ofstudents among area advantage saves time money disadvantage non usually can not claim representative much complicated expensive be at spur moment take whoever available convenience chooses closest live respondents captive audience e g using class ofintro psych quota ...