ufacturer knows that the number of items produced per hour by machine A and by machine B are normally distributed with a standard deviation of 4.4 items for machine ard deviation of 6.5 items for machine B. The mean hourly amount produced by machine A for a random sample of 57 hours was 229 units; the mean hourly amount pro ne B for a random sample of 47 hours was 215 units. Find a 99% confidence interval for the difference in mean parts produced per hour by these two machines. onfidence interval is

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