PSYC 200 Lecture 14: Sampling
3 Mar 2017
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Individual samples will differ from a) one another and b) the population they"re drawn from. The bigger the sample, the more closely it approximates the population. How much do we expect our sample data to deviate from pop. If accurate description of pop characteristics probability sampling. If hyp testing (examining relations btn variables) non-probability sampling. True random samples = extremely rare in psych research. Representative sample = a must for accurate, unbiased estimates/description of pop characteristics. Ex: census-type data, national political opinion polls. Every person in pop has equal chance of being selected. Every nth person is selected from sampling frame. Cases from each stratum considered based on their. Can do without a pop sampling frame. Initial random sample = clusters, not individuals randomly selecting counties then randomly selecting the middle schools in those selected counties then randomly selecting classrooms in those middle schools then randomly selecting students.
