Question

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 3.7 with a sample standard deviation of 1.8. Seven specimens of treated wastewater had an average benzene concentration of 7.2 with a standard deviation of 3. 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 M1 denote the mean benzene concentration for untreated water and M2 denote the mean benzene concentration for treated water. Use the Alpha= 0.01 level the P-value method with the TI-84 Plus calculator.

1/ State the appropriate null and alternate hypotheses?

2/ P-value?

Answer 1