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I am looking for a formal definition of "drawing samples" (or simply of "samples"), can somebody help me?

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    Then I think you have been answered. I hope it helps.2012-01-04

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I am sure you are referring to random sampling.

The random variables $X_1,X_2,...X_n$ are called a random sample of size $n$ from the population with pdf $f(x)$ if $X_1,X_2,...X_n$ are mutually independent and the marginal pdf of each of them is exactly $f(x)$.