Jesus wept, they're a mardy bunch on the Norwich board. Never say never. If West Brom lose their last game 1-0, Norwich can stay up with a 17-0 win. Just because it's highly unlikely, doesn't mean it's impossible. Too many fans write their team off too early in the season.
They weren't rooting for Sunderland, but as Dave rightly pointed out their best chance of survival was a cricket score for Sunderland against West Brom. Don't know why everyone is saying 17 and exaggerating - given that West Brom's goal difference would have to be at least one worse than now 16 will be enough to see Norwich ahead on goals scored.
I would point out that there only has to be 16 goals between Norwich and West Brom, so if West Brom lose by 8 and Norwich win by 8... Sounds slightly more plausible?