Acompany 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 11 parts at each facility be tracked from start to finish and the time required be recorded. the recorded sample data was as follows:
automated
x1 = 56.7 hours
s1 = 4.1 hours
manual
x2 = 67.5 hours
s2 = 3.6 hours
1. assuming that the populations are normally distributed with equal population variances, construct and interpret a 98% confidence interval estimate.