six sigma black belt certification from ASQ

Kapil,
Regarding your question about the Black Belt examination prep materials — Here is a good source for some statistical questions (with answers) to test yourself:http://www2.gsu.edu/~dscbms/ibs/qcontent.htmlThese questions have a terrific pedigree: they are part of database of questions and answers developed under a grant from the U.S. National Science Foundation (NSF).
A wide variety of stats topics related to Six Sigma are covered, including:Descriptive Statistics;Basic Probability Concepts;Probability Distributions;Data Collection Methods;Making Inferences about One Population;Hypothesis Testing;Analysis of Variance (ANOVA); andRegression Analysis
… hope this is helpful to your examiniation preparation efforts …
 
Best regards,
QualityColorado

The primer from the Quality Council of Indiana is excellent.  It has practice questions for each BOK.

The Certified Six Sigma Black Belt Handbook was a good reference (published by ASQ).  Ironically there are several errors in the book (not what I would expect from ASQ press), but the book follows the ASQ SSBB Body of Knowledge very well, and provides a good reference as a study guide for the exam.  It includes practice questions for each chapter, and a sample exam as well.  I just took the exam on March 3rd (and passed), and this book was a very helpful addition to my reference materials.