PSC 41 Lecture 8: Lecture 8 - 5/2/17
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PSC 41 Full Course Notes
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Document Summary
Introduction and rationale: generalizability (external validity, two sources of errors, chance and bias, probability samples (representative, random and stratified, nonprobability samples, quota, purposive, and convenience. Literary digest results: landon 57%, roosevelt 43, actual results, landon 38%, roosevelt 62, landon 8 electoral votes, roosevelt 523 electoral votes, sample unrepresentative of the population. Depression during this time, so rich people would have phones, cars, and magazine subscriptions. External validity: generalizability, do results apply to, the entire pop, other people, other settings, other situations, research conducted with a representative sample will have stronger external validity, research conducted with a non-representative sample will have weaker external validity. Error in sampling: error is the extent to which the sample different from the pop, sampling error, no 2 samples will be the same; there will be variation, random error, sample bias. If your sample is selected systematically: constant error.
