The Essentials of Statistics 3rd Edition by Joseph Healey

تمرين 5

SW: The same sample of social workers reports an average annual salary of $25,782, with a standard deviation of $622. Is this figure significantly higher than the national average of $24,509? (Hint: The wording of the research hypotheses suggests a one-tailed test. What form would the research hypothesis take, and where would the critical region begin?)