Summary Outlined.pdf - Sampling/ Bias SRS ● A sample taken...

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Sampling/ BiasSRSA sample taken in a way that everyone has an equal chance to be selectedOne in which every possible sample of the desired size has an equal chance of beingselectedAdvantageThe simplicity of simple random sampling makes it relatively easy to interpretdata collectedRequires minimal advance knowledge of the population other than knowing thecomplete sampling frameSimple random sampling allows us to make generalizations from the sample tothe populationDisadvantageDifficult to execute when the population is largeRequire to contact nonrespondents repeatedly→ time consumingMay leave out groups you want to be sure are represented.Systematic Random SamplePick every nth personAdvantageSimilar members together→ end up with a kind of stratified sample→ easilyimplementedDisadvantageHappens to a periodic structure similar to the period of the sampling→ verybiasedStratified Random SampleDivide population on a variable that may affect the response(homogenous group)
AdvantageSamples taken within a stratum have little variability→ resulting estimates are

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Experimental Study vs Observational Study

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