(1 point) Periodically, the county Water Department tests the drinking water of homeowners for contaminants such as lead and copper. The lead and copper levels in water specimens collected in 1998 for a sample of 10 residents of a subdevelopement of the county are shown below. Round intermediate calculations to 5 decimal places and final answers to 4 decimal places. lead (ug/L) copper (mg/L) 4.1 0.44 2.1 0.381 4.6 0.617 4.4 0.84 3.4 0.161 0.1 0.824 5.1 0.185 0.7 0.113 3.8 5.7 0.872 0.375 (a) Construct a 99% confidence interval for the mean lead level in water specimans of the subdevelopment. (b) Construct a 99% confidence interval for the mean copper level in water specimans of the subdevelopment.