Actually, I'm a much better speller now because of spell checks than I was in school, so this theory is incorrect
Proof by example much? One success story does not prove every case. It's also not necessarily even a success story, since this is not a proper controlled experiment. How can you really say you became a better speller because of spell check and not, say, just due to simple experience/practice of writing multiple papers over the years? You can't-- there's no control. This is
exactly what conjecture is.