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example: reporters interview 600 people aged over 18 in Ho Chi minh city, If applicable sample selection method intended for categories, we can segment the nest according to gender and age as follows: select the 200 people (100 male and 100 female) aged from 18 to 40, select 200 people (100 male and 100 female) aged 40 or over , Then the investigator may choose the ones near your home or facilitate their investigations to be quickly finished the work.
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