The surface finish of metal parts made on four machines is being studied. An experiment is conducted in which each machine is run by three different operators and two specimens from each operator are collected and tested. Because of the location of the machines, different operators are used on each machine, and the operators are chosen at random. The data are shown in the following table. Analyze the data and draw conclusions.

 

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Machine 1 Machine 2 Machine 3 Machine 4 Operator 1 2 3 1 3 1 2 3 1 2 3 79 94 46 92 85 76 88 53 46 36 40 62 62 74 57 99 79 68 75 56 57 53 56 47