35. 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 dis- agreement. 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 simi- lar 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, and 15 stockbrokers. The results obtained follow.

Real Estate Agent 81 Architect Stockbroker 43 65 48 63 48 68 60 69 52 57 91 54 54 70 62 77 67 76 68 83 56 57 75 61 61 53 65 80 64 50 71 54 69 37 72 83 73 65 85 84 58 75 58 58 Use a = .05 to test for any significant difference in job stress among the three professions.