INTRODUCTION TO SURVEY SAMPLING. February 23, 2011 Karen Foote Retzer Survey Research Laboratory University of Illinois at Chicago www.srl.uic.edu. Census or sample?. Census: Gathering information about every individual in a population Sample:
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February 23, 2011
Karen Foote Retzer
Survey Research Laboratory
University of Illinois at Chicago
Definition: The population to which we want to generalize our findings.
where n = sample size; N = population size
n = no/(1 + no/N)
From Random Digit Dial to
Address Based Sampling