user: Question: what is the total number for reason for change is district Michigan 3rd?
Columns: ['District', 'Vacator', 'Reason for change', 'Successor', 'Date successor seated']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Georgia 2nd', 'Vacant', 'Rep. Edward E. Cox died during previous congress', 'J. L. Pilcher (D)', 'February 4, 1953']
SQL:

assistant: SELECT COUNT("Reason for change") FROM "Table" WHERE "District" = 'Michigan 3rd';