Examlex
A ______________ of size n is a sample selected in such a way that every possible sample of size n has the same chance of being selected.
By
A preposition indicating agency, means, or location; used to specify the person or thing that performs an action or through which a result is obtained.
Quite
Used as an adverb to indicate a considerable degree or fully; extremely.
It's
abbreviation for "it is" or "it has."
Been
The past participle of "be," used in perfect tenses to indicate an action that occurred at an unspecified time before now.
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