Table: manager_changes_7
Columns: team
outgoing_manager
manner_of_departure
date_of_vacancy
replaced_by
date_of_appointment
position_in_table

Question: Who was the manager that was positioned 11th in table and resigned in departure?
SQL: SELECT "replaced_by" FROM manager_changes_7 WHERE "position_in_table" = '11th' AND "manner_of_departure" = 'resigned'