Submit qui Periodically, a town water department tests the the drinking water of homeowners for contaminants such as lea

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Submit Qui Periodically A Town Water Department Tests The The Drinking Water Of Homeowners For Contaminants Such As Lea 1 (67.98 KiB) Viewed 12 times

Submit qui Periodically, a town water department tests the the drinking water of homeowners for contaminants such as lead. The lead levels in water specimens collected for sample of 10 residents of the town had a mean of 3.3 mg/l, and a standard deviation of 2.4 mg/L. Complete parts a through c m a. Construct a 90% confidence interval for the mean lead level in water specimens from the town. (Round to three decimal places as needed.) b. Interpret the interval in terms of this application, Choose the correct answer below. point(s) possible A. The water department can be 90% confident that the mean lead level in drinking water for all residents in the town is within this interval. OB. The water department can be 10% confident that the mean lead level in drinking water for all residents in the town is within this interval OC. The water department can be 90% confident that the mean lead level in drinking water for all residents in the town is outside this interval. OD. The water department can be 90% confident that the mean lead level in drinking water for all residents in the town is 3.3 mg/l OE. The water department is confident that 90% of the mean lead level in drinking water for all residents in the town is described by this interval c. What is meant by the phrase "90% confidence interval"? of those intervals would contain the true population mean The phrase "90% confidence interval means that if many intervals were constructed using the same methods and the same 0% then Next