Who do younger women (mostly) raise their voices at the end of a sentence, making it sound like a question?

I know I read something about this a while back, but I can’t remember what it was. Still, there could be many theories as to why this happens. I’ve heard guys do this, too, but not folks who are out of their twenties, I think. It annoys a lot of professors, who tell their students they are in college, and should behave like serious people.

However, maybe this habit runs deeper. Maybe it isn’t a sign of questioning, but something else? What do you think?