The concentration of benzene was measured in units of milligrams per liter for a simple random sample
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The concentration of benzene was measured in units of milligrams per liter for a simple random sample of five specimens of untreated wastewater produced at a gas field. The sample mean was 7.8 with a sample standard deviation of 1.4. Seven specimens of treated wastewater had an average benzene concentration of 3.2 with a standard deviation of 1.7. It is reasonable to assume that both samples come from populations that are approximately normal. Construct a 99%
confidence interval for the reduction in benzene concentration after treatment.
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