25 most commonly misspelled words
via Mankiw, view Newmark's Door
I missed 3.
One of them I absolutely did not know.
Speaking of not knowing, Diane McGuinness has a section in Early Reading Instruction confirming as a universal my impression that a person's spelling deteriorates dramatically when he's exposed to misspellings.* This is why, she says, teachers should not give multiple choice spelling tests. **
Which is exactly the kind of test 25 most commonly misspelled words is. Two of the words I missed because I caught a glimpse of the choices and promptly forgot the correct spelling.
Not so with the third. I was as convinced of the correctness of my chosen spelling as I was of my chosen answer to what is 6 x 7? for God knows how many years. (you may have to hit refresh a couple of times)
* Seeing misspelled words strongly depressed spelling scores, and the probability of using the same misspelling was high (.76). p. 118
** Ditto invented spelling.