One theory regarding the mobility of college and university faculty members is that those who publish the most scholarly articles are also the most mobile. The logic behind this theory is that good researchers who publish frequently receive more job offers and are therefore more likely to move from one university to another. The Academy of Management Journal (Vol.

25, 1982) examined this relationship for persons employed in industry. Using the personnel records of a large national oil company, the researchers obtained thc early career performance records for 529 of the company's employees. Of these, 174 were classified as stuyers, those who stayed with the company; the other 355, who left the company at varying points during a 15-year period, were classified as leavers. Summary statistics on three variables-initial performance, rate of career advancement (number of promotions per year), and final performance appraisals-for both stayers and leavers are shown in the table on p. 424. For each variable, compare the means of stayers and leavers using an appropriate statistical method. Interpret the results.