Mathematics, 27.12.2020 04:30 msjsnell29
A County Water Department tested the drinking water of randomly selected 10 homeowners for lead and copper contamination. The test results yielded sample mean and sample standard deviation for lead as 2.89 and 3.92 (in µg/L), respectively, and for copper as 0.4083 and 0.2495 (in mg/L), respectively. a) Set up 90% confidence interval for the mean lead level in drinking water in that county and interpret the result. (3 Points) b) Set up 90% confidence interval for the mean copper level in drinking water in that county and interpret the result. (3 Points) c) What are the underlying assumptions? (1 Point)
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A County Water Department tested the drinking water of randomly selected 10 homeowners for lead and...
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