I'm preparing for the CSSBB exam and have noticed that some questions in the study guide have no reference in the handbook.
For example, on page 128 (study guide), question 21 is asking when was Orthogonal array first developed. And there is no mention of the Orthogonal array in the study guide.
The same goes for questions 24 (parameter design), and 25,…, etc.
Please let me know your feedback. Maybe I'm missing something here.