ASQ ASQ Certifications CSSGB Questions & Answers

• Question 311:

  Explain the purpose of a Gage RandR study.

  Correct Answer: The purpose of a Gage RandR study is to define the validity of a measurement system, specifically, to estimate the proportion of observed variation due to unit-to-unit variation and measurement variation.

• Question 312:

  Construct a Gage RandR run chart from the following data.

  

  Correct Answer: Check the answer in explanation.

  

  

• Question 313:

  Explain how flowcharts can be constructed to identify and highlight the non-value added steps in a process.

  Correct Answer: Check the answer in explanation.

  

• Question 314:

  Explain the relationship between Y = f(X) and a flowchart in respect to Six Sigma management.

  Correct Answer: Check the answer in explanation.

  As you can see from the following figure, CTQ1= f(X1, X2, X3, X4, X5) and CTQ 2= f(X1, X2, X3, X4, X5)

  

• Question 315:

  Explain how Failure Modes and Effects Analysis (FMEA) is used to identify the Xs that cause CTQs to be out of specification. Construct a table to illustrate your explanation.

  Correct Answer: Check the answer in explanation.

  Failure Mode and Effects Analysis (FMEA) is used to identify, estimate, prioritize, and reduce the risk of failure in CTQs through the development of countermeasures based on Xs. There are 10 steps to conducting a FMEA. First, team members identify the critical parameters and their potential failure modes through brainstorming or other tools, that is, ways in which the design might fail (columns 1 and 2 of the table below). Second, team members identify the potential effect of each failure (consequences of that failure) and rate its severity (columns 3 and 4 of the table below). The definition of the severity scale is shown below. Third, team members identify causes of the effects and rate their likelihood of occurrence (columns 5 and 6 of the table below). The definition of the likelihood of occurrence scale is shown below. Fifth, team members identify the current controls for detecting each failure mode and rate the organization's ability to detect each failure mode (columns 7 and 8 of the table below). The definition of the detection scale is shown below.

  Sixth, team members calculate the RPN (Risk Priority Number) for each failure mode by multiplying the values in columns 4, 6 and 8 (column 9 of the table below). Seventh, team members identify recommended actions and contingency plans, persons responsible, and target completion dates for reducing or eliminating each failure mode (columns 10 and 11 of the table below). Eight, team members identify the date the action was taken to reduce or eliminate each failure mode (column 12 of the table below). Ninth, team members rank the severity (column 12 of the table below), occurrence (column 13 of the table below) and detection (column 14 of the table below) of each failure mode after the recommended action (column 10 of the table below) has been put into motion. Tenth, team members multiple the values in columns 13, 14 and 15 of the table below to calculate the RPN (Risk Priority Number) for each failure mode after the recommended action (column 16 of the table below) has been put into motion.

  

• Question 316:

  Define “capability of the process” in statistical terms.

  Correct Answer: Capability is a measure of the relative relationship between the “Voice of the Process” and the “Voice of the Customer.” This relationship considers the differential between the mean and nominal of the process. The capability of a stable and normally distributed process is defined as 99.73% of its output will be in the interval between LNL(mean + 3[ R /d2]) and UNL (mean - 3[ R /d2]), given measurement data and a subgroup size between 2 and 10 inclusive.

• Question 317:

  Construct a dot plot for the CTQ. Construct dot plots to study the CTQ for the different levels of X1 and X2. Construct main effects plots and interaction plots for the following data set.

  

  Correct Answer: Check the answer in explanation.

  

  There is a significant interaction between X1 and X2 that will affect the CTQ. The interaction is seen in the crossed lines.

• Question 318:

  Explain the purpose of a 2k full factorial design.

  Correct Answer: The purpose of a 2k full factorial design is to understand the relationships between a set of Xs each with only two levels, and the interactions of the X's, on the CTQ's.

• Question 319:

  Create the standard order matrix for a 23 full factorial design.

  Correct Answer: Check the answer in explanation.

  

• Question 320:

  Explain how the standard order matrix for a 23 full factorial design is used to estimate the effects of one main factor on the CTQ.

  Correct Answer: Add up the values of the CTQ for which the X is +, then add up the values of the CTQ for which X is -, finally, divide the difference of the sums by the number of plus signs.