Are her RIT scores invalid because it is her first time taking the NWEA tests?
I doubt it. It is more likley to be an underestimate of her abilities than an overestimate.
If they are skeptical, you could ask for her to take the version the second graders took.
http://www.nwea.org/support/details.aspx?content=1024Is it possible for students to get a falsely inflated score by guessing?
By nature, it's impossible to know when a score is "inflated." However, the number of means by which one can get an inflated score are generally limited to either guessing or cheating. Cheating can be difficult if the room is monitored properly and few students will ever be "lucky" with their guessing.
On the other hand, any number of things can deflate a score. Fatigue, hunger, anger, boredom, or distraction can all have negative impacts on a student's performance. It is more likely that a score that doesn�t reflect a student�s true ability will be deflated than inflated.
