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A random sample of companies in electric utilities (I), financial services (II), and food processing (III)...

A random sample of companies in electric utilities (I), financial services (II), and food processing (III) gave the following information regarding annual profit per employee (units is thousands of dollars). Shall we reject the null hypothesis that there is no difference in mean profit per employee at the 1% level of significance?

I. 49.1, 43.4, 32.9, 27.8, 38.3, 36.1, 20.2

II. 55.6, 25.0, 41.3, 29.9, 39.5

III. 39.0, 37.3, 10.8, 32.5, 15.8, 42.6

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