(1 point) Periodically, the county Water Department tests the drinking water of homeowners for contminants such as lead
Posted: Mon Nov 15, 2021 12:24 pm
(1 point) Periodically, the county Water Department tests the drinking water of homeowners for contminants 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. lead (ug/L) copper (mg/L) 1.3 0.575 0.5 0.268 1.2 0.594 0.2 0.265 3.1 0.332 2.6 0.098 3.8 0.491 4.1 0.31 3.9 0.783 1.9 0.131 Assume a normal distribution for both the lead and copper levels. (a) Construct a 99% confidence interval for the mean lead level in water specimans of the subdevelopment. <μ και (b) Construct a 99% confidence interval for the mean copper level in water specimans of the subdevelopment. Sus