A study reported in the Journal of Small Business Management concluded that self-employed individuals do not experience higher job satisfaction than individuals who are not self-employed. In this study, job satisfaction is measured using 18 items, each of which is rated using a Likert-type scale with 1-5 response options ranging from strong agreement to strong disagreement. A higher score on this scale indicates a higher degree of job satisfaction. The sum of the ratings for the 18 items, ranging from 18-90, is used as the measure of job satisfaction. Suppose that this approach was used to measure the job satisfaction for lawyers, physical therapists, cabinetmakers, and systems analysts. The results obtained for a sample of 10 individuals from each profession follow. Lawyer: 44, 42, 74, 42, 53, 50, 45, 48, 64, 38
Physical Therapist: 55, 78, 80, 86, 60, 59, 62, 52, 55, 50
Cabinetmaker: 54, 65, 79, 69, 79, 64, 59, 78, 84, 60
Systems Analyst: 44, 73, 71, 60, 64, 66, 41, 55, 76, 62
At the a =.05 level of significance, test for any differences in the job satisfaction among the four professions. What is the value of the test statistic?
a. 4.866.
b. 12.323.
c. 6.047.
d. 8.465.