A company that does manufacturing work has one facility that is automated and one that has manual functions. In order to estimate the difference in mean time it takes to complete a part on the two lines, the company has requested that a random sample of
parts at each facility be tracked from start to finish and the time required be recorded. The sample data to the right were recorded. Assuming that the populations are normally distributed with equal population variances, construct and interpret
confidence interval estimate.
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confidence interval for the difference between the two population means for the length of time it takes to make a part from start to finish is