CREATE TABLE table_30503 ("Conference" TEXT, "Regular Season Winner" TEXT, "Conference Player of the Year" TEXT, "Conference Tournament" TEXT, "Tournament Venue  ( City ) " TEXT, "Tournament Winner" TEXT)

During the Big Seven Conference which team was the regular season winner?
SELECT "Regular Season Winner" FROM table_30503 WHERE "Conference" = 'Big Seven Conference'
SELECT "Regular Season Winner" FROM "table_30503" WHERE "Conference" = 'Big Seven Conference'