It seems, according to discussion on a forum I found, to be very widespread. A small but significant minority of people all over the English speaking world seem to have been taught the incorrect spelling: http://www.oneofus.co.uk/forums/index.php?showtopic=195
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Date: 2008-01-10 09:17 pm (UTC)http://www.oneofus.co.uk/forums/index.php?showtopic=195