Engineering, 23.10.2019 23:00 Littllesue2
3. a civil engineer is analyzing the compressive strength of concrete. compressive strength is normally distributed with σ2 = 1000 (psi)2 . a random sample of 12 specimens has a mean compressive strength of 3250 psi. (a) construct a 95% two-sided confidence interval on the mean compressive strength. (b) suppose it is desired to estimate the mean compressive strength with an error that is less than 15 psi at 99% confidence. what is the sample size required?
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3. a civil engineer is analyzing the compressive strength of concrete. compressive strength is norma...
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