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An instrument used to collect a sample from a population. Surveying often refers to sampling of human populations and is primarily done by administering questionnaires or interviewing individuals.

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TelephoneSurvey, when to call?

I conduce a prestudy to understand when is the best time to call bakers for a telephone survey. … Also, I record if the baker accepted the survey, and if he answered the phone at all How would you optimize this design so that I require fewer calls? …