What motivates employees? The Great Place to Work Institute evaluated nonfinancial factors both globally and in the United States. (Data extracted from L. Petrecca, “ Tech Companies Top List of ‘ Great Workplaces,’” USA Today, October 31, 2011, p. 7B.) The results, which indicate the importance rating of each factor, are stored in Motivation .
a. At the 0.05 level of significance, is there evidence of a difference in the mean rating between global and U. S. employees?
b. What assumption is necessary about the population distribution in order to perform this test?
c. Use a graphical method to evaluate the validity of the assumption in (b).

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