A. In a study about Job Satisfaction among Supervisors, 245 were surveyed to measure satisfaction on their work. Their mean satisfaction is 40.52 with a standard deviation of 8.25. At the 0.05 level of significance, test the claim that the mean for all supervisors is 47, the national norm for people of comparable educational levels. (20 points) Hypothesis: Ho: Ha: Level of Significance: a = df = Critical/Tabular Value: Decision Rule: At level of significance, reject Ho if Test Statistic: Computed Value: Decision: Conclusion