If you need help, like I did, understanding basic concepts relating to test scores,and how descriptive and inferential statistics and their meanings apply to education, I would highly recommend purchasing this book. Although I wish the price for this paperback was a bit less, it's worth the money. I'm currently using a more technical book on the subject for one of my classes, and this book certainly helped clarify basic principles and applications due to the simple manner in which the author examines and explains the ideas.