A recent study took a look at how and why students use Wikipedia. Here’s what they concluded:
Overall, college students use Wikipedia. But, they do so knowing its limitation. They use Wikipedia just as most of us do — because it is a quick way to get started and it has some, but not deep, credibility.
This research suggests that college students are not using Wikipedia as a way out of an assignment but more likely as a way into an assignment.
I would like to see a similar study done at the high school level.