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Phosphate values are normally distributed

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Phosphate pollution of lakes and rivers is a considerable problem. Elevated phosphate levels can cause algal blooms and rapid eutrophication of freshwater ecosys- tems. To protect these ecosystems several strict pollution laws were enacted. The phosphate levels in a river were measured at several randomly chosen sites down- stream from a chemical plant before and after these laws were passed. The follow- ing measurements were recorded in μg/l units. Was there a significant decrease in phosphate levels after the laws were enacted? Assume the phosphate values are normally distributed.

Reference no: EM132392847

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