SSH 301 Lecture Notes - Lecture 4: Alf Landon, Snowball Sampling, Simple Random Sample
17 Oct 2017
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In 1920 correctly predicted a harding victory (over cox) 1936 mailed out 10 million ballots: used auto registration lists & used telephone directories, 2 million ballots came back, predicted: alf landon victory (r) - reality: franklin d, roosevelt (d) victory. What went wrong: mostly wealthy americans had access to receiving ballots, large sample isn"t enough, how sample is selected is very important. Elements: units that make up a population (each person; each corn chip; each ad). Population: aggregate or totality of the elements in a study (collection of all possible elements) Ex: all ads in a magazine: methods students. Sample: a subset of elements (units) a researcher selects from the larger population pool. Ex: select 10 ads from total of 100; 25 students from class list. Sampling frame: the list of all elements (units/ cases) that make up a population, from which a sample is selected in probability sampling.
