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 a sample of 10 residents of the town...

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 a sample of 10 residents of the town had a mean of 2, 3mg / L and a standard deviation of 1,3 mg / L. Construct 80 % confidence interval for the mean lead level in drinking water for all residents in the town . Find critical value ( s ) Choose ... Find margin of error Choose ... The confidence interval is Choose ... Interpret the results Choose ...