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Checking for Pollution

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A common method of checking for pollution in a river is to measure the dissolved oxygen content in the river water at different locations. A reduction of oxygen content in the water from one location to another indicates the presence of pollution somewhere between the two locations. The Environmental Protection Agency (EPA) suspected that a small town was dumping untreated sewage into a river running through a town. Six random specimens of river water were taken at a location above town and five such specimens below the town. The dissolved oxygen readings, in parts per million, are shown below. Use alpha = .10 to see if the EPA should be concerned. Also, is the test dependent or independent?

Above Town Below Town

4.8 4.7 4.9 5.1

5.2 5.1 5.0 4.6

5.0 4.9 4.8

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