I define and discuss the differences of observational studies and experiments. I then discuss the difference between a sample and a census. I introduce two types of sampling techniques that yield biased results...Voluntary Response and Convenience Sampling. I discuss Stratified Random Samples, Stratified Random Sample, Cluster Samples, and Multistage Samples. I finish by defining Undercoverage, Non-Response, discuss causes of Biased Results, define Inference, and preview Sample Distributions.
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