There is concern that increased industrialization may be increasing the mineral content of river water. ten years ago, thesilicon content of the water in a certain river was 5 mg/ l. eighty-five water samples taken recently from the river havemean silicon content 5.6 mg/l and standard deviation 1.2 mg/ l. can you conclude that the silicon content of the water isgreater today than it was 10 years ago?