http://www.ma.utexas.edu/users/parker/sampling/repl.htm
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The representative part of Population is called Sample.
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Once an individual is selected, the individual cannot be selected again.
Random sampling is the sample group of subjects that are selected by chance, without bias. Random assignment is when each subject of the sample has an equal chance of being in either the experimental or control group of an experiment.
What is the difference between the population and sample regression functions? Is this a distinction without difference?