Question

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 σ = .000965 mm. Assume a random sample of 58 sheets of metal resulted in an x̄=.3193 mm. Calculate the 98 percent confidence interval for the true mean metal thickness. (Round your answers to 4 decimal places.) The 98% confidence interval is from — to—

Answer 1

0.3193   2.326 ( 0.000965 / 58 )

0.3193   0.0003

( 0.3190 , 0.3196 )

At 98 %, CI for Mean is from  0.3190 to  0.3196