Introduction to Estimation
, X¯ +z α/2 σ √ n (2) to contain, or to cover, the unknown population mean µ is 1 − α; and we now have a so-called confidence in-terval for µ. Note that the interval estimator (2) is con-structed from X¯, z α/2, σ, and n, all of which are known. The user-specified value 1− α is called the confidence level or coverage ...
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