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 2.9 mg/L and a standard deviation of 1.2 mgfL. Complete parts a through c. a. Construct a 90% condence interval for the mean lead level in water specimens from the town. b. Interpret the interval in terms of this application. Choose the correct answer below. The water department can be 95% condent that the mean lead level in drinking water for all residents in the town is 2.9mgfL. The water department can be?95%?condent that the mean lead level in drinking water for all residents in the town is within this interval. The water department can be?95%?condent that the mean lead level in drinking water for all residents in the town is outside this interval. The water department can be?5%?condent that the mean lead level in drinking water for all residents in the town is within this interval. The water department is condent that?95%?of the mean lead level in drinking water for all residents in the town is described by this interval. c. What is meant by the phrase?"95%?condence interval"? * * *The phrase "95%?condence interval" means that if many intervals were constructed using the same methods and the same ?then? %?of those intervals would oontain the true