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to select a random sample you pick them at random
Statistics is the science of making effective use of numerical data relating to groups of individuals or experiments sampling is an important to statistics because It deals with all aspects of this including not only the collection analysis and interpretation of such data but also the planning of the collection of data -SDOT15DELEON
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Two random samples are dependent if each data value in one sample can be paired with a corresponding data value in the other sample.