An indexed family of sets (Alhet is said to be a cover of a set X if and only if X CUieIA . Use this idea to prove that if (Cie1 and (D), are two different covers of a nonempty set A then (C,n DuCx forms a cover of A

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.