SW

a. Nationally, social workers average 10.2 years of experience. In a random sample, 203 social workers in greater metropolitan Shinbone average only 8.7 years with a standard deviation of 0.52. Are social workers in Shinbone signifi cantly less experienced? (Note the wording of the research hypotheses. These situations may justify one-tailed tests of signifi cance. If you chose a one-tailed test, what form would the research hypothesis take, and where would the critical region begin?)

b. The same sample of social workers reports an average annual salary of $25,782 with a standard deviation of $622. Is this fi gure signifi cantly higher than the national average of $24,509? (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?)