ICBB Cost Practice Questions
The free ICBB: IASSC Certified Lean Six Sigma Black Belt questions that deal with cost, with answers and explanations. The full bank and the timed practice test cover every topic the exam asks about.
Question #1
A Belt has determined that the inventory of repair parts at a rework station can be reduced by 45%. According to Cost of Poor Quality (COPQ) definitions inventory reduction would be considered ______.
Correct answer: D
Explanation
Cutting repair-part inventory releases real money tied up in stock and reduces carrying cost, a quantifiable balance-sheet gain, so it counts as hard savings rather than soft savings such as time or morale improvements.
Question #3
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 $4,200 in order to stay within budget. Using a sample of 35 first article components, a Mean of the new product upgrade price of $4,060, and a Standard Deviation of $98 was estimated. The Alternative Hypothesis in the above example is?
Correct answer: E
Explanation
The requirement, average cost less than or equal to $4,200, is the null hypothesis, so the alternative is its complement: the Mean is greater than $4,200. The alternative never states equality or uses the sample mean.
Question #8
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 theBelt’s effort requiring that the average cost of an internal critical raw material component be less than or equal to $3,600 in order to stay within budget. Using a sample of 42 first article components, a Mean of the new product upgrade price of $3,200 and a Standard Deviation of $180 was estimated. Based on the data provided, the Z value for the data assuming a Normal Distribution is?
Correct answer: B
Explanation
Z equals the difference between the specification and the mean divided by the standard deviation: (3,600 - 3,200) / 180 = 400 / 180 = 2.22.
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