Duane,

I had the same kind of students' reaction when I first introduced TBL.
Instead of giving hints, I chose to offer a Question & Answer period (5 to
10 minutes) prior to the iRAT. It is important to say that you will answer
all questions even if they are on the test. 

The response has been great. It has completely alleviated students' anxiety
regarding the iRAT.

Pat