POLSCI 3N06 Lecture Notes - Convenience Sampling, Confidence Interval, Sampling Error
23 Nov 2013
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Political science 3n06 2013 lecture 6b a sample of sampling. Sampling strategy of some type is always necessary. Allows you to justify looking at a small piece of a whole. Do not need to look at the entire element; Every sample take, will be slightly different from the population that the sample was taken from. Sampling error will depend on: the nature of the procedure followed. If it was not based on probabilistic means; cannot measure the kind of error. Even if done in a probabilistic way there will be some difference between the small and large; but can measure using probability theorem. Probability samples have errors that can be estimated. Non-probability samples have errors that cannot be precisely estimated: they may introduce unknown systematic bias into the sample, the sample size. Decrease sample size; the confidence interval increases. Non-probabilistic techniques may be required or even desired, depending upon the. Non-probabilistic samples purposes of your research the population of interest.
