Question: There is concern that increased industrialization may be increasing the mineral content of river water. Ten years ago, the silicon content of the water in

There is concern that increased industrialization may be increasing the mineral content of river water. Ten years ago, the silicon content of the water in a certain river was 5 mg/L. Eighty-five water samples taken recently from the river have mean silicon content 5.6 mg/L and standard deviation 1.2 mg/L. Can you conclude that the silicon content of the water is greater today than it was 10 years ago?

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