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benzene was measured in units of milligrams per liter for a simple random sample of...

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benzene was measured in units of milligrams per liter for a simple random sample of live specimens of untreated wastewater produced at a gas field The sample mean was 4 4 with a sample standard deviation of 1 7 Seven specimens of treated wastewater had an avera benzene concentration of 7 6 with a standard deviation of 3 2 It is reasonable to assume that both samples come from populations that are approximately normal Can you conclude that the mean benzene concentration is more in treated water than in untreated water Let u denote the mean benzene concentration for untreated water and denote the mean benzene concentration for treated water Use the a 0 05 level the P value method with the TL B Plus calculator Part 1 of 4 State the appropriate null and alternate hypotheses Ho 1 H This is a left tailed Part 1 4 Part 2 of 4 test

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