Five specimens of untreated wastewater produced at a gas field had an average benzene concentration of 6.83
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Five specimens of untreated wastewater produced at a gas field had an average benzene concentration of 6.83 mg/L with a standard deviation of 1.72 mg/L. Seven specimens of treated waste water had an average benzene concentration of 3.32 mg/L with a standard deviation of 1.17 mg/L. Find a 95% confidence interval for the reduction in benzene concentration after treatment.
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X 683 s X 172 n X 5 Y 332 s Y 117 n Y 7 Th...View the full answer
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