Question: A study reported in the Journal of Small Business Management concluded that self-employed individuals experience higher job stress than individuals who are not self-employed. In this study job stress was assessed with a 15 -item scale designed to measure various aspects of ambiguity and role conflict. Ratings for each of the 15 items were made using a scale with 1-5 response options ranging from strong agreement to strong disagreement. The sum of the ratings for the 15 items for each individual surveyed is between 15 and 75, with higher values indicating a higher degree of job stress. Suppose that a singular approach, using a 20 -item scale with 1-5 response options, was used to measure the job stress of individuals for 15 randomly selected real estate agents, 15 architects, an 15 stockbrokers. The results obtained follow.

Use a = .05 to test for any significant difference in job stress among the three professional:

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