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[See Solution] Lead and copper in drinking water. Periodically, the Hillsborough County (Florida) Water Department tests the drinking water of homeowners for

Question: Lead and copper in drinking water. Periodically, the Hillsborough County (Florida) Water Department tests the drinking water of homeowners for contaminants such as lead and copper. The lead and copper levels in water Specimens collected for a sample of 10 residents of the Crystal Lake Manors subdivision are shown below.

Lead Copper
1.32 0.508
0 0.279
13.1 0.32
0.919 0.904
0.657 0.221
3 0.283
1.32 0.475
4.09 0.13
4.45 0.22
0 0.743
  1. Construct a 99% confidence interval for the mean lead level in water specimens from Crystal Lake Manors.
  2. Construct a 99% confidence interval for the mean copper level in water specimens from Crystal Lake Manors.
  3. Interpret the intervals, parts a and b, in the words of the problem.
  4. Discuss the meaning of the phrase, "99% confident."

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