The milling machine in the fabrication department of your company produces a very important part for the products you sell. You are given the following historical data on the machine (from a SAMPLE of n = 25 weeks): Machine Breakdowns/week Number of parts Produced/week (X) average # of machine breakdowns/week: X bar = 50 standard deviation of # of machine breakdowns/week: Sx=15 n-25 (Y) average # of parts produced/week: Y bar 170 standard deviation of # of parts produced/week: Sy=40 n=25 Compute an 80% Confidence Interval for the mean number of parts produced by this machine has in a week.