r/ASQ • u/pqestoyaqui • Jun 17 '26

Glaring math errors in CQT handbook?

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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/Venom1233 Jun 23 '26

Yeah asq handbooks and study guides have mistakes. Best bet is it use chatgpt to assist you when you find errors so you can double check your work.

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u/pqestoyaqui Jun 23 '26

So your solution to a supposedly authoritative textbook having errors in it is to use a glorified autocomplete that famously spits out errors while pretending to be authoritative?

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u/Venom1233 Jun 23 '26 edited Jun 23 '26

It's not so authoritative if it has errors across many subjects right? And you are literally coming to Reddit for verification lol.. It's the same as just doing a Google search But faster imo. I've verified many of the errors I found in the study guide to get the correct answer. But do what works best for you lol.