Good luck in your senior project for college. I took the survery as well.
For my important passwords I use a random set of letters, a capital and a number.
But for my wireless password, since I don't have to remember it, I go all out. 63 random printable ASCII characters is my game and, from what I understand, most WPA crackers are dictionary/reference based -- suffice it to say it has never been compromised.
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