Economics: Profits per Employee How productive are U.S. workers? One way to answer this question is to study annual profits per employee. A random sample of companies in computers (I), aerospace (II), heavy equipment (III), and broadcasting (IV) gave the following data regarding annual profits per employee (units in thousands of dollars) (Source: Forbes Top Companies, edited by J. T. Davis, John Wiley and Sons).

I II III IV 27.8 13.3 22.3 17.1 23.8 9.9 20.9 16.9 14.1 11.7 7.2 14.3 8.8 8.6 12.8 15.2 11.9 6.6 7.0 10.1 19.3 9.0 Shall we reject or not reject the claim that there is no difference in population mean annual profits per employee in each of the four types of companies? Use a 5% level of significance.

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