> is mimicking the valley girl inflection :-) I was thinking this but couldn't find the right phrase. It could also be expressing uncertainty. You want to mak

> is mimicking the valley girl inflection :-) I was thinking this but couldn't find the right phrase. It could also be expressing uncertainty. You want to make an assertion but not 100% sure you are right. A question mark at the end expresses some self doubt and leaves it open to correction. I use '?' that way quite often.