Find the level of confidence assigned to an interval estimate of the mean formed using the following
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a. x-1.28 . σΤ to X + 1.28 . ơr b.--1.44 . στ to X+ 1.44 . στ c.--1.96 . dr to x + 1.96-Tz d. 1-2.33-Vr to x + 2.33 . στ
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