Quality quiz (September 2016)—and August’s quiz winners!

Winners of last month’s quiz and a copy of Practical Tools for Continuous Improvement: Volume 1 are Roberta Martinez (F&B Manufacturing, AZ); Surinder Sikand (Siemens Milltronics Process Instruments, ON); and Kimberly Hammond (Gritman Medical Center, ID). Congratulations! For this month’s quiz, and a chance to win a copy of Practical Tools for Continuous Improvement: Volume 2, submit your response by September 30.

Amazingly, Jan U. Wari has been invited to be a guest lecturer at her local community college. Professor Stan Deviation, her mentor, has nearly given up on the possibility that Wari will become a competent statistician, but knowing that the best way to learn something is to teach it, he recommends Wari for the position, which involves a lecture instructing students about statistics and problem solving.

Wari, who fails in her attempts to secure the title of “Professor,” nonetheless forges ahead with plans for her first lesson. Of course, she has to take several days off from her position at Greer Grate & Gate, since class preparation is so demanding. She decides that she will begin with basic data analysis, to warm up her students and let them experience her own wisdom firsthand.

“Three ways of looking at data are through the concepts of central location, shape, and variability,” she drones. Several students seem to be intent on the content of her lecture, recording her every word on their PDAs. Occasionally their serious concentration seems to be punctuated by beeps and trills, but Wari assumes that the noises are generated by overloading their systems with formulas.

Emboldened, Wari moves next to the concept of control charts, leading the class through an exercise on creating X-bar and R charts, when a student raises her hand to ask a question—always a dangerous moment for Wari, who only skates on the surface of understanding these concepts herself. The student asks about Ishikawa diagrams, which she has noticed are used by colleagues in her part-time job at a local hospital.

Since Wari has never heard of Ishikawa diagrams, she has no idea what she’s talking about. Never at a loss, however, she recovers her composure by defining the Taguchi loss function, since that’s the only statistical concept she knows with a Japanese name and she assumes they must be related. So she defines Ishikawa diagrams for the student: “That’s a complex statistical methodology used to measure costs when you’re off target,” she says confidently. (Wari is known for her confident attitude.)

Is Wari herself off target? Or did she happen to accidentally score a bull’s eye in her definition?

a) Amazingly, she has managed to identify the Ishikawa diagram without ever seeing one.

b) Sorry, Wari. The only thing Taguchi and Ishikawa have in common is that they’re both named after Japanese statisticians.

2 thoughts on “Quality quiz (September 2016)—and August’s quiz winners!

  1. Offhand, it would most certainly be the case that “Dr” Wari is way off base by equating an Ishikawa Diagram (presumably a “Fishbone” diagram typically used to qualitatively identify causes affecting the quality outcome of a process) to Taguchi’s focus on loss function and the totality of loss to society due to deviation from target or quality. At least, I’ve never thought or seen an Ishikawa Diagram being using to statistically quantify degree of quality; not that I’ve known or seen.

  2. It is sad to say, but I think there are more clueless people that claim to know everything than we realize. I also think it is equally as sad that people who claim to be a quality professional only know the text-book concepts and never learn the “real-world” application of these concepts.

    For example, I find that even with people that have been at high level positions within the Quality function that really don’t understand Cpk…

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