A manufacturer knows that the number of items produced per hour by machine A and by machine B are normally distributed with a standard deviation of 4.5 items for machine A and a standard deviation of 6.9 items for machine B. The mean hourly amount produced by machine A for a random sample of 51 hours was 229 units; the mean hourly amount produced by machine B for a random sample of 43 hours was 215 units. Find a 99% confidence interval for the difference in mean parts produced per hour by these two machines. The confidence interval is- (Round to four decimal places as needed) (D

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