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sample" is the typical terminology, but in probability, it is more common to say "IID."
* Identically distributed means that there are no overall trends -- the distribution does not fluctuate and all items in the sample are taken from the same probability distribution.
* Independent means that the sample items are all independent events. In other words, they are not connected to each other in any way; knowledge of the value of one variable gives no information about the value

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