Mathematics, 03.12.2019 22:31 luckyalita

Acivil engineer is analyzing the compressive strength of concrete. compressive strength is approximately normally distributed with variance σ 2 = 1000 psi2 . a random sample of 12 specimens has a mean compressive strength of ¯x = 3255.42 psi. (a) test the hypothesis that mean compressive strength is 3500 psi. use a fixed-level test with α = 0.01.

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