Periodically, the Hillsborough County (Florida) Water Department tests the drinking water of homeowners for contaminants such as
Question:
a. Locate a 90% confidence interval for the mean lead level in water specimens from Crystal Lakes Manors on the printout.
b. Locate a 90% confidence interval for the mean copper level in water specimens from Crystal Lakes Manors on the printout.
c. Interpret the intervals, parts a and b, in the words of the problem.
d. Discuss the meaning of the phrase "90% confident."
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Related Book For
Statistics For Business And Economics
ISBN: 9780321826237
12th Edition
Authors: James T. McClave, P. George Benson, Terry T Sincich
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