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Mathematics, 16.04.2020 00:21 Softball5378

Nitrates are groundwater contaminants derived from fertilizer, septic tank seepage and other sewage. Nitrate poisoning is particularly hazardous to infants under the age of 6 months. The maximum contaminant level (MCL) is the highest level of a contaminant the government allows in drinking water. For nitrates, the MCL is 10mg/L. The health department wants to know what proportion of wells in Madison Count that have nitrate levels above the MCL. A worker has been assigned to take a simple random sample of wells in the county, measure the nitrate levels, and assess compliance. What sample size should the health department obtain if the estimate is desired to be within 2% with 95% confidence if: (hint: there are two different methods)There is no prior information available?
A study conducted two years ago showed that approximately 7% of the wells in Madison County had nitrate levels exceeding the MCL?

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Nitrates are groundwater contaminants derived from fertilizer, septic tank seepage and other sewage....

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