IASSC Certified Lean Six Sigma Black Belt

Here you have the best Six Sigma ICBB practice exam questions

You have 243 total questions to study from
Each page has 5 questions, making a total of 49 pages
You can navigate through the pages using the buttons at the bottom
This questions were last updated on November 20, 2025
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Question 1 of 243

A ___________ is used primarily to track the stability of the average value of a metric of interest.

NP Chart

Xbar-R Chart

I-MR Chart

C Chart

Correct Answer: B

Question 2 of 243

The Control Limits width varies if the sample size varies for which type of chart?

P Charts

NP Charts

Xbar-R Charts

Time Series Charts

Correct Answer: A

The control limits in a P-chart, which is used for plotting the proportion of defectives, vary with changes in sample size. Because the control limits are calculated using the sample size (n), differing sample sizes from one subgroup to another will result in different control limits.

Question 3 of 243

Which of these elements are not included in Implementation plans?

Work breakdown structure

Risk management plans

Cost/Benefit ratios

Planned audits of work completion

Correct Answer: C

Cost/Benefit ratios are typically included in the business case or project charter rather than in implementation plans. Implementation plans more commonly include a work breakdown structure, risk management plans, and planned audits of work completion.

Question 4 of 243

Upon completion and validation of an improvement to a process a Belt and the Project Team create a Control Plan that contains which of these?

Standard operating work description of the process change

Description of the monitoring system in place to assure continued compliance

Summary of the targeted critical metrics for process performance measurement

All of the above

Correct Answer: D

Question 5 of 243

What conclusion is most correct about the Experimental Design shown here with the response in the far right column?
Exam ICBB: Question 5 - Image 1

No factor has enough statistical confidence greater than 95% to have an impact on the response rate

Constant, Adv and Bev are the only factors statistically affecting the response rate with 95% confidence or more

If the Adv is increased from the low level to the high level, the response rate increases

The response level is statistically concluded to only need the Adv and Bev factors set at the low level to get the largest response rate

This design does not have enough experimental runs to conclude anything as evidenced by the lack of P-values in the MINITABTM output

Correct Answer: D