After a heavy storm the waste water holding tanks at a waste

After a heavy storm, the waste water holding tanks at a waste water treatment plant on the New River overflowed dumping 1,000,000 gallons of sewage into the New River. You are part of the New River Citizen Watch Group, which monitors the health of portions of the New River for government agencies like the EPA and USDA. This sewage discharge event causes your group to wonder if the event has had a negative impact on the quality of the water downstream of the waste water treatment plant. To test your group\'s idea that the sewage has negatively impacted water quality, you measure in triplicate the 96 EPT of a site upstream of the waste water treatment plant and a site downstream of the waste water treatment plant. You calculate the mean EPT of both sites and the 95% confidence intervals of both samples. Your results are shown below. Use this scenario and data to answer the following questions. 120 100 60 Upstream site Downstream site

Solution

Answer:

j. The mean % EPT of the site downstream of the waste water treatment plant will be significantly lower than the mean % EPT of the site upstream of the waste water treatment plant.