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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 =

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= .000669 mm. Assume a random sample of 52 sheets of metal resulted in anx

x

= .2378 mm.

Calculate the 90 percent confidence interval for the true mean metal thickness.(Round your answers to 4 decimal places.)

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