This year Agency H instituted a policy whereby all managers would be rated by their direct reports on their overall performance in the past year. One manager, Tina, who has 25 direct reports, received eight poor ratings for overall job performance. Tina's manager, John, assumed that these results indicated Tina was doing a poor job as a manager compared to other managers in the Agency. Which of the following statements, if true, would most seriously weaken the above argument?