While studying for the CQE certification exam, I found some errors and clarifications worth noting. I hope that you find the following notes to be helpful in smoothing out your quest for CQE certification.
Please feel free to comment in this blog post below if you have anything else to add. Thank you!
Corrections:
page 397 – ex.### “Shift” not “Machine” 
page 403 – fitted regression 
page 456 –
the Process Performance Indicies Pp and Ppk are not defined (ran out of space??), Anyway, here are the formulas:
Pp = (USL – LSL) / 6s
WHERE s = sample standard deviation
Ppk = min [(USL – s) / 3s , ( s – LSL ) / 3s ]
Minor Error: Formula 7.2 for the RPN formula represents the “Detection” variable with a “P”. Correction: Instead it should be a “D” for Detection.
Explicitly, RPN = Severity * Occurrence * Detection
Source: https://www.fmea-fmeca.com/fmea-rpn.html
Clarifications:
page 430 – formula 6.151 calculate np(bar)
When combined with formula 5.150, another way to think/calculate np(bar) is: sum(Xi) / m. where sum(Xi) is the sum of all nonconforming items Xi, and m are the number of subgroups.
page 494 – Definition of “Risk Oversight”
“Risk Oversight” was never defined in these pages and is used commonly in this Section of the Chapter. According to ICGN, “Risk oversight is defined as the board’s supervision of the risk management framework and risk management process.” The book references the “Risk Attitude” which is the qualitative driver that guides the Risk Management decisions – and is sometimes called “Riskiness”. Riskiness is based on the sum of the expected benefits and perceived risks.
page 454 Process capability ratios vs Capability ratios
“process capability ratio” – ideally greater than1 – see Table 6.49 for Cp
“capability ratio” – ideally less than 1 – is the inverse of the Cp.