Researchers test the usefulness (in months) of  three different systems on tested on four companies. Test at a = 0.05 of the mean usefulness of the a)three different systems; b) different companies   System COMPANY 1 COMPANY 2 COMPANY 3 COMPANY 4 A 45 48 50 45 B 46 41 47 46 C 51 50 45 41

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