Exercise3.7 Showthatthe (1)100% confidenceinterval(3.4)fortheunknownnormalmean has aminimalexpectedlengthwhenitissymmetric,thatis, 1 = /2.

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Exercise3.7 Showthatthe (1−α)100% confidenceinterval(3.4)fortheunknownnormalmean

μ has aminimalexpectedlengthwhenitissymmetric,thatis, α1 = α/2.

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