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14. A...
14. A researcher wants to know what fraction of municipal water sources in Kansas contain hazardous levels of arsenic. The researcher randomly selects 100 municipal water sources and determines that 23 of them have an unsafe level of arsenic. (a) Determine a 99% confidence interval for the proportion. State this interval below within an interpretive sentence tied to the given context. b) The contamination rate of arsenic for all Kansas municipal water sources had previously been reported to be 10%. Is there evidence at the 99% confidence level that the arsenic level is higher than 10%? Explain your reasoning.