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NEW QUESTION # 236
Calculate the estimated variance of the population from which the following values have been randomly selected: 2.8 2.7 2.6 2.9 2.8 2.8 2.8:
Answer: D
Explanation:
The variance formula will be used for calculating the estimated variance of the given data. The formula is: N = 7
= 2.77
(x
)2
NEW QUESTION # 237
Which of the following tools could be used during the optimize phase of a DMADOV project?
Answer: B
Explanation:
The best answer is A. Design of experiments . The CSSBB DFSS material states that in the optimize stage of the IDOV model, the team uses process capability information, statistical tolerancing, and robust design .
Robust design and optimization commonly rely on experimental methods, and the DOE material further explains that design of experiments is used to determine settings for the inputs to optimize the response .
Although the cited optimize description is shown under IDOV, the same optimization intent carries into DMADOV , which explicitly contains an Optimize phase. Among the answer choices, DOE is the tool most directly associated with optimization. QFD and CTQ trees are primarily front-end customer-requirement tools, while FMEA is mainly used for anticipating failure modes and risk. Therefore, the tool that could be used during the optimize phase is Design of experiments , making A the verified best answer.
NEW QUESTION # 238
A principle disadvantage of fractional factorial experimental designs is:
Answer: E
NEW QUESTION # 239
In a regression analysis, the prediction interval is used to
Answer: B
Explanation:
The correct answer is D. define a probable range for a single observation . In the CSSBB regression material, prediction error and the estimation of error variance are discussed as part of building a boundary around predicted values. The text notes that the first step toward acquiring a boundary on a prediction error is estimating the error variance from SSE and degrees of freedom.
This is the purpose of a prediction interval : it gives a likely range for an individual future observation at a given value of the predictor. That is different from a confidence interval, which estimates the likely range of the mean response . The prediction interval is therefore wider because it must account for both uncertainty in the estimated regression line and the natural scatter of individual data points around that line. It is not primarily used to validate the model, prove cause and effect, or replace confidence intervals based on sample size. Therefore, the verified CSSBB-aligned answer is D .
NEW QUESTION # 240
Rank in order, from first to last, the sequence of steps a team should take to build a house of quality.
* Develop a relationship matrix
* Identify the technical requirements
* Capture the voice of the customer
* Determine the target values
Answer: B
Explanation:
The correct answer is C. 3, 2, 1, 4 . The CSSBB source explains that QFD, or the house of quality , begins with the customer needs or wants on the left side of the house. The design features and requirements are then identified as the technical response on the top of the house, and the primary matrix is the relationship matrix between customer needs and design features. Finally, the foundation contains the target values .
That sequence means the team must first capture the voice of the customer so it knows what the customer wants. Next, it must identify the technical requirements that can respond to those needs. Then the team develops the relationship matrix to connect customer requirements to technical features. After that, the team can determine the target values for the technical characteristics. This order is fully aligned with the structure of the house of quality shown in the CSSBB material. Therefore, the correct sequence is 3, 2, 1, 4 , which corresponds to option C .
NEW QUESTION # 241
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