Thanks for your question!
This time I thought I'd hand it over to one of my UX buddies at Optimal Workshop to answer. So here's Matt with a couple of great recommendations.
The books Matt refers to in this video are:
- Measuring the User Experience: Collecting, Analyzing, and Presenting Usability Metrics by Tom Tullis an Bill Albert
- Quantifying the User Experience: Practical Statistics for User Research by Jeff Sauro and James R. Lewis
Who is UX Agony Aunt? Can she help me?!
She certainly can! Head on over to her place and find out what she can help you with, and how you can submit a question.