You are an operations manager for a local steel manufacturing company, and you are in the process of selecting a vendor for a new type of metal finishing machine. for the past week you’ve tested machines from three different companies and collected the randomly sampled data below that shows how many parts each machine produced in seven different one-hour periods over the course of your manufacturing test. is the average production of these machines the same, or is one of them different from the others? [if the productivity is the same, you will simply choose the machine with the lowest cost.] you may assume that all populations are independent and nearly normal. test at the 98% confidence level.