9.4.2 Test a hypothesis about a proportion using the critical value method. 28 [7 points] A nationwide survey of working adults indicates that only 45% of them are satisfied with their jobs. The president of a large company believes that more than 45% of employees at his company are satisfied. He surveys a random sample of 111 employees, and 45 of them report that they are satisfied with their jobs. Can he conclude that more than 45% of employees at the company are satisfied with their jobs? Use the = 0.05 level of significance. [Hint: Z= p-Po Po(1-Po) n o Statistic: o If z za we reject Ho.