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PSYCH 291 (44)
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6-samplingprocedure.docx

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School
University of Waterloo
Department
Psychology
Course
PSYCH 291
Professor
Richard Eibach
Semester
Fall

Description
PSYCH 291 SAMPLING PROCEDURES SEPT 26 Example) Methodology of the Literary Digests 1939 Presidential Poll - Poll conducted by mailing postcards to telephone/car owners, magazine subscribers - Prediction based on 2 million returned postcards, Landon predicted to win 57% of popular vote  Sample biased towards wealthy Republicans rather than average New Dealers  Received 23% response rate (only enthusiastic people/ those seeking change) Sampling Concepts and Terms - Population: groups of all individuals to whom researchers intend to generalize their results - Census: study includes all members of population as participants - Sample: subset of population of interest that researchers observe in their study (studying 5% of waterloo undergrads to infer characteristics of entire group) - Population Parameter: attribute of population whose value the researchers are trying to estimate (eg. Waterloo undergrads’ confidence level in employment prospects) - Sample Statistic: value of attribute that researchers observe in sample (eg. Average level of confidence reported by individuals whom participated in surve
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