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1. A large water pipeline is being constructed to link a town with a fresh water aquifer. A construction supervisor measured the diameters of 40
1. A large water pipeline is being constructed to link a town with a fresh water aquifer. A construction supervisor measured the diameters of 40 pipe segments and found that the mean diameter was 25.5 cm. In the past, pipe manufactured by the same company have had a standard deviation of 7 mm. Determine a 95% confidence interval for the mean diameter of the pipe segments
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