01:920:311 Lecture Notes - Lecture 9: Random Number Table, Sampling Frame, Cluster Sampling
18 Mar 2016
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Document Summary
The sample the participants in the study: smaller part of the population that is manageable. Can only represent the population in which it is drawn: elements: the individual members of the population children, nurses, schools, police officers, etc. Sampling determines generalizability: we need a representative sample of the population in order to generalize, might need to take steps that key groups are in the sample (gender, race, etc. ) What is a representative sample: a sample that looks like the population, the distribution of characteristics among the elements of a representative sample is the same as the total population. We often do not know if we have a representative sample. Sampling consideration #1: do you need a representative sample: usually we do want this sample for generalizability. Systematic random selection to make sure there is no bias and we know the chance each element had of being selected: each individual has the same probability of being chosen.
