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A student researcher working in a hurman development lab on campus would like to estimate the proportion of those who work, or go to school on campus that have chidren. She takes a random sample from each sub-population, faculty, staff, undergraduate students and oraduate students and asks De you have children thatrpart tmer This sampie is an example of a voluntary sample simple random sample convenience sample stratified random sample vystamatic random sample
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this is an example of stratified random sampling because here the total population is divided into sub population and then from each sub population we take random sample , so it is a stratified sampling.Here the sub populations are staff , faculty , undergraduate students , post graduate student etc .....

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