A leakage test was conducted to determine the effectiveness of a geal designed to keep the inside of a plug airtight. An air needle was inserted into the plug, and the plug and needle were placed under water. The pressure was then increased until leakage was observed Let X equal the pressure in pounds per square inch. Aggume that the distribution of x is N(M.0²). The following n=5 observations of x were obtained 3.3 4.5 3.5 3.1 2.8 Joe the observations to find a 95%. confidence terval for M. (to.oas (4) = 2.7764, to.025 (5) = 2.5706, to.05 (4) = 2.1318, to.os (5) = 2.0150, 20.00 = 1.645, 05 20.025 1.96) L

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