In 1998, the results of a survey of 2,221 MBA students from across the United States conducted by the Stockholm-based...

In 1998, the results of a survey of 2,221 MBA students from across the United States conducted by the Stockholm-based academic consulting firm Universum showed that only 20 percent of MBA students expect to stay at their first job five years or more. Assuming that a random sample was employed, find a 95 percent confidence interval for the proportion of all U.S. MBA students who expect to stay at their first job five years or more. Based on this interval, is there strong evidence that less than one fourth of all U.S. MBA students expect to stay?