ork. Chapter 8 (Sections 8.1 through ... 1 Saved Check my work The Ball Corporation's beverage can manufacturing plant in Fort Atkinson, Wisconsin, uses a metal supplier that provides metal with a known thickness standard deviation = .000619 mm. Assume a random sample of 46 sheets of metal resulted in an r = 1903 mm. Calculate the 99 percent confidence interval for the true mean metal thickness. (Round your answers to 4 decimal places.) The 99% confidence interval is to from