摘要：It is increasingly recognized that knowledge of the target audience can strengthen education and outreach programs. The study described here explores whether the method of collecting data from a target audience influences results. Using data for the same questions collected at a county fair, through the Internet, in a mail survey, and in a phone survey, our findings indicate that data collected through convenience surveys are not representative of the larger population. An implication of this finding is that organizations conducting surveys need to clearly define their goals for the survey data before choosing a method of survey delivery.
关键词：convenience sample surveys ; random sample surveys ; educational targeting ; water quality ; nonpoint source pollution
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