Six Sigma Certification Questions

[Ted Hessing]

Have questions or comments on how to prepare for your Six Sigma certification? Ask them here.

[Reynaldo Torres]

I missed the cut of for CSSGB date so I decided to just take Villanova exam. What questions do i expect to see in Villanova Certification exam for Black belt? are those similar to ASQ exam questions?

Thanks,
Rey

[Ted Hessing]

Hi Rey,

Conceptually I found there to be about 60% overlap between the ASQ and Villanova exams. The difference is that Villanova references guest speakers a lot.

In my opinion the ASQ questions were much harder logically but the Villanova questions required you to remember exactly what was in their materials.

I prepared for the Villanova by re-taking all of the quizzes they had in their course. Also, you have to make sure to read up on all of the notes from their weekly recitations. The instructors often gave different spin on topics than the videos did. Also, the instructors had extra questions and problem sets and external reference books that were not covered in the video lectures.

If you ‘re interested in how I approached the Villanova exam, see this article here.

[John Houser]

Hi,
I have a Question from the sample ASQ PDF Exam on the site. Question 25:

For a process, Xbar = 35.0 and σ = 5.00. If the subgroup
size is n = 5, what is the value for the upper control limit
for the process?

What do we use to solve this?

[John Houser]

Nevermind.

I found the answer on your website: https://sixsigmastudyguide.com/control-chart/

UCL = mean + 3 * [ sigma / sqrt(n) ]
UCL = 35 + 3 * [ 5.00 / sqrt(5) ]
UCL = 41.71

What is strange, is that this formula is not on the IASSC reference document. Hmmm….

[John Houser]

Hi,

One more question from the sample ASQ exam from the site. Question 31:

When σ = 10, what sample size is needed to specify a
95% confidence interval of ±3 units from the mean?

What do we use to solve this?

I am studying for the IASSC exam, and this ASQ exam was under the black belt practice exams. Hopefully this is the type of question on the IASSC exam too.

Thank you,
John

[Reynaldo Torres]

let me guess:

n=(Z*sigma/3)^2
n=(1.96*10/3)^2
n= (19.6/3)^2
n= 6.5 or 7 sample size

[John Houser]

ASQ sample says the answer is 43, not 7.

Any ideas?

Thanks.

[Reynaldo Torres]

Yes it is 42.6 or 43
My mistake not paying attention to detail.
i forgot to multiply ^2
=(19.6/3)^2
=6.5^2
=42.6

great catch.

[Swarnima]

Where do I get the six sigma green belt practice exam questions?

[Ted Hessing]

Hi Swarnima. You can see practice exams here. The full study guides, with mock exams that mimic what you will really see on exam day, are here.

[Rudi]

Hi Ted,
I am an Industrial Engineer by profession so a lot of the 6 Sigma concepts are quite familiar to me though I am very rusty in terms of the BOK.
I noticed reading this forum that there are three organisations that offer certification IASSC, ASQ and Villanova, maybe more?.
Does it make any difference which organisation I sit for the black belt exam?.
Secondly, I would like to study all concepts again, how can I get a pdf of the study guide and where could I please get exercises to practice apart from the exam samples?
Many thanks
Rudi
Sydney, Australia

[Ted Hessing]

Hi Rudi, I am in favor of the ASQ exams, but it depends on your situation. Here’s a larger discussion on the differences.

[reham elmahdy]

Does anyone know the solution for this:

Availability: 8 hours were available but it only ran 6 hours
Performance: 300 units were produced
Quality: Of 300 items produced, 30 were defective
OEE is 40.5%
How many items should this process have produced in the available time?

[Ted Hessing]

Hi Reham,

This one sat here far too long without an answer from me. Here’s how to work it, for you and for anyone else who lands on this thread.

OEE = Availability x Performance x Quality.

• Availability = run time / available time = 6 / 8 = 75%
• Quality = good units / total units = 270 / 300 = 90%
• So Performance = 40.5% / (0.75 x 0.90) = 60%

Performance compares what the line actually made to what it should have made at its ideal rate during the time it ran. 300 units is 60% of ideal, so the ideal output for the 6 hours it ran is 300 / 0.60 = 500 units. That’s an ideal rate of about 83.3 units per hour.

Over the full 8 available hours, that rate gives 83.3 x 8 = about 667 units. That’s the answer to the question as written. Read the wording carefully on exam day, though: “in the available time” points to 667, while “in the time it ran” would be 500.

Quick sanity check: 667 x 40.5% = 270, which is the number of good units. That’s a handy way to think about OEE on the shop floor. It’s good units divided by what a perfect line would have made in the time you had.

There’s more on the three OEE losses in my Total Productive Maintenance (TPM) article.

If anything else in this thread is still bugging you, ask here.

Ted

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