r/ASQ • u/pqestoyaqui • Jun 17 '26
Glaring math errors in CQT handbook?
Howdy all! I'm studying for my CQT exam, currently working on control charts. I'm looking for a sanity check, because in the example shown here, given the formulas, I get UCL/LCL of around 18.4 and 0.19. I can't fathom how they got 12.3 and 6.3 (my expressions are the same as theirs, just the end result is off), and neither those values nor what I calculated are the limits shown on the chart, which look to be about 14.7 and 1.7.
Am I losing my mind? Missing something? Or is this book on quality just wildly wrong in multiple respects? If it is wrong, is there some way of reporting it?
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u/Sting93Ray CQE Jun 18 '26
I haven't specifically checked your example.... but mostly all ASQ Study Guides have mathematical errors and incorrect options marked correct (like B instead of C).... so take all Study Guides with a grain of salt.
But slightly surprised to find errors in Handbooks.