CREATE TABLE table_30967 ("Episode" FLOAT, "Broadcast date" TEXT, "Guest ( s ) " TEXT, "Singer ( s ) " TEXT, "Ratings" TEXT)

how many guest stars did the episode that was broadcasted 11september2012 have
SELECT COUNT("Guest(s)") FROM table_30967 WHERE "Broadcast date" = '11September2012'
SELECT COUNT("Guest(s)") FROM "table_30967" WHERE "Broadcast date" = '11September2012'