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IASSC Certified Lean Six Sigma Black Belt (IASSC_ICBB) - IASSC Exam Questions

Last updated on June 20, 2026

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300 Total Questions
1
Question
Use this data to calculate the Z Score. Average of: 92, Standard Deviation: 2, Upper Spec Limit: 101
Options
A 1.5
B 0.75
C 4.50
D 2.25
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2
Question
Which statement is NOT correct about the Fitted Line Plot shown here?

Exhibit
Options
A If the reactant was 6 units, with 95 % confidence we would expect a minimum yield of 100 units
B When the reactant increases, the expected yield would increase
C The independent variable is the reactant
D A reactant value between 2 and 4 units yields around 20 to 40
E With at least 95% confidence, we can expect less than 10 units of Yield when the reactant is at a
value of 1
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3
Question
A Belt working in a supply chain environment has to make a decision to change suppliers of critical raw materials for a new product upgrade. The purchasing manager is depending on the Belt’s effort requiring that the average cost of an internal critical raw material component be less than or equal to
$2,800 in order to stay within budget. Using a sample of 55 first article components, a Mean of the
new product upgrade price of $2,240 and a Standard Deviation of $120 was estimated. Based on the
data provided, the Z value for the data assuming a Normal Distribution is?
Options
A 6.48
B 2.33
C 8.28
D 4.67
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4
Question
For the data set shown here which of these statements is/are true?

Exhibit
Options
A A Paired T-test would be applicable for comparing Grade B and Grade A since they follow each other in the data set
B Hypothesis Testing of Means or Medians cannot be done since there are an unequal number of observations for the 3 samples
C Grade A has a higher sample Mean than Grade B
D Grade A has the lowest sample Mean of the 3 samples
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5
Question
Which statement(s) are incorrect for the Regression Analysis shown here? (Note: There are 2 correct

Exhibit
Reveal Only
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