Question 1

Cost of Poor Quality (COPQ) can be classified as Tangible (Visible) Costs and Hidden Costs.

Accepted Answer

Tangible costs are visible and can be directly measured, such as the cost of rework, scrap, and warranty claims. Hidden costs are indirect and include things such as lost productivity and customer dissatisfaction. Therefore, COPQ can be classified into both categories.

Question 2

A 1-Sample t-test is used to compare an expected population Mean to a target.

Accepted Answer

A 1-Sample t-test is used to determine whether a sample mean is significantly different from the hypothesized population mean. It is used to test a single sample against a known or hypothesized population mean, not a target value.

Question 3

Which statement(s) are true about the Fitted Line Plot shown here? (Note: There are 2 correct answers).

Accepted Answer

The answer of Which statement(s) are true about the Fitted...

Question 4

One of the metrics commonly used in Lean Six Sigma is DPU. This acronym stands for ___________________.

Accepted Answer

DPU stands for Defects per Unit, making choice B the correct answer. The other options (A, C, and D) do not accurately describe the concept of DPU in Lean Six Sigma.

Question 5

Contingency Tables are used to do which of these? (Note: There are 2 correct answers).

Accepted Answer

Contingency tables are used to compare more than two sample proportions with each other (B) and are applicable to data that is attribute in nature (E), as they display the frequency distribution of variables.

Question 6

According to the definition of Rolled Throughput Yield which of these items best describe the purpose of RTY?

Accepted Answer

Rolled Throughput Yield (RTY) accounts for losses due to rework and scrap, and gives an overall measure of the overall yield of a process. It considers the yield of each step, taking into account the number of parts or units that pass through the process, and calculates the total yield of the process.

Question 7

Those who are trained to the skill levels of a Black Belt are typically utilized to apply Lean Six Sigma methodologies what percentage of their time?

Accepted Answer

The answer of Those who are trained to the skill...

Question 8

The Regression Model for an observed value of Y contains the term ?o which represents the Y axis intercept when X = 0.

Accepted Answer

The term ?o in the regression model represents the Y-axis intercept or the value of Y when X is zero. Therefore, the statement is true.

Question 9

When it comes to Control one of the most effective means of eliminating defects is to _________________ .

Accepted Answer

Designing defect prevention into the product is the best choice because it addresses the root cause of defects and eliminates them at the source. Training personnel and keeping a Six Sigma project ongoing can also help reduce defects, but they are only addressing the symptoms of the problem and may not be as effective in the long run. Having each process consist of no more than five steps may be a good guideline, but it is not necessarily the most effective means of eliminating defects.

Question 10

It is a Type I error if we reject the Null Hypothesis when it is actually true.

Accepted Answer

This statement defines a Type I error, which occurs when we incorrectly reject the Null Hypothesis (i.e. conclude that there is a significant effect when there actually isn't).

Question 11

Lean Six Sigma's general approach to solving significant challenges related to a process is called _________________.

Accepted Answer

The general approach to solving significant challenges related to a process in Lean Six Sigma is called DMAIC, which stands for define, measure, analyze, improve, and control. DOE (design of experiments), SIPOC (suppliers, inputs, process, outputs, customers), and FMEA (failure mode and effects analysis) are all specific tools and methodologies within the Lean Six Sigma framework, but they are not the general approach to solving process challenges.

Question 12

Unequal Variances can be the result of differing types of distributions.

Accepted Answer

Unequal variances can occur when the sample data is from different types of distributions, such as skewed or heavy-tailed distributions.

Question 13

Training cost is $4,000 and a project required an initial investment of $30,000. If the project yields monthly savings of $2,000 beginning after 3 months, what is the payback period in months (before money costs and taxes)?

Accepted Answer

The answer of Training cost is $4,000 and a project...

Question 14

A Belt will occasionally do a quick experiment referred to as an OFAT which stands for ____________________.

Accepted Answer

OFAT stands for One Factor At a Time.

Question 15

Having an Alpha of .05 and a Beta of .10 are the most common risk levels when running a Statistical test.

Accepted Answer

Alpha of 0.05 is a common significance level indicating a 5% risk of Type I error, and Beta of 0.10 indicates a 10% risk of Type II error, which are typical thresholds in hypothesis testing.

Question 16

After a Belt has put data through the smoothing process which chart would be used to look for trends in the data?

Accepted Answer

A moving average chart is used to look for trends in the data by smoothing out fluctuations over time. This is the chart typically used after data has gone through a smoothing process. The other chart options (Multi-Vari Chart, X bar Chart, and Pareto Chart) are more suited for other types of data analysis and control.

Question 17

If a process has Outliers which pair of charts is most preferable if subgroups will exist for the Continuous Data?

Accepted Answer

Xbar-R Charts are most preferable for continuous data with subgroups because they provide information about the central tendency and variability of the process.

Question 18

The Lean Principle action in the 5S approach that deals with having those items needed regularly at hand and those items need less regularly stored out of the way is known as ___________.

Accepted Answer

The Lean principle action in the 5S approach that deals with having those items needed regularly at hand and those items need less regularly stored out of the way is known as sorting. The other actions of the 5S approach are as follows:
- Shining: Keeping the workplace clean and organized
- Standardizing: Developing standard procedures for the workplace
- Sustaining: Ensuring that the 5S approach is continually implemented and maintained.

Question 19

Which statement(s) describe an undesirable situation when implementing SPC?

Accepted Answer

The answer of Which statement(s) describe an undesirable situation when...

Question 20

The perfect sample size is the minimum number of data points required to provide exactly 6% overlap or risk if one wants a 95% confidence level.

Accepted Answer

The perfect sample size depends on various factors, including the size of the population, the level of confidence desired, and the margin of error. While a sample size with a 95% confidence level and 6% overlap may be sufficient for some studies, it is not necessarily the perfect sample size for all studies.

Exam 6: Six Sigma Green Belt