Here (perhaps for onlookers more than for your exact case) are more two favorite recommendations for free Web-based resources on what statistics is as a discipline, both of which recommend good textbooks for follow-up study:
"Advice to Mathematics Teachers on Evaluating Introductory Statistics Textbooks" by Robert W. Hayden
"Advice to Mathematics Teachers on Evaluating Introductory Statistics Textbooks" by Robert W. Hayden
http://statland.org/MyPapers/MAAFIXED.PDF
"The Introductory Statistics Course: A Ptolemaic Curriculum?" by George W. Cobb
http://repositories.cdlib.org/cgi/viewcontent.cgi?article=10...
Both are excellent introductions to what statistics is as a discipline and how it is related to, but distinct from, mathematics.
A very good list of statistics textbooks appears here:
http://web.mac.com/mrmathman/MrMathMan/New_Teacher_Resources...