study guide 4
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Ashford University *
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SSG120
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Industrial Engineering
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Feb 20, 2024
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docx
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Uploaded by rm19818
This method of designed experiment allows for the study of ALL main effects and interactions
Fractional factorial Taguchi Full factorial Latin squares Question 3
4 / 4 pts
You are trying to determine if the average call length at a call center has decreased since you have introduced process improvements. You will use hypothesis testing to do this. What is the alternative hypothesis?
The average call time after the changes is equal to the average call time before the changes The average call time after the changes is less than the average call time before the changes The average call time after the changes is greater than or equal to the average call time before the changes The average call time after the changes is less than or equal to the average call time before the changes Question 4
4 / 4 pts
Why is the improve phase so important to the process?
It provides a measure to compare against the baseline It determines if the project has been successful It is where action is first taken It forces you to choose the best solution Question 5
4 / 4 pts
Which of the following is a good situation to use the student-t distribution?
When trying to validate a claim about a population mean given a sample set of 50 pieces of data When trying to validate a claim about a population mean given a sample set of 20 pieces of data When trying to compare two population variances When trying to determine the independence or dependence of two factors Question 6
4 / 4 pts
During the critical root causes tollgate, what do you need to prove to the sponsor?
That the project is time-sensitive and needs to be a priority That the root causes identified are critical to the team That the causes that were eliminated were definitively not correct That eliminating the critical root causes will close gaps in performance Question 7
4 / 4 pts
When investigating potential root causes, what might be useful if the list becomes overwhelming?
Having team members vote on the one that’s most likely Trim down the root causes to no more than five Group them into meaningful categories but keep the full list None of the above Question 8
4 / 4 pts
The null hypothesis is
What we accept when the test stat falls in the critical region What we expect to happen due to chance alone The theory or assumption we are testing for Proven true when the test stat does not fall in the critical region Question 9
What are the elements of a good implementation plan?
People, budget, change management, time line, and measures for success Specific, Measurable, Attainable, Relevant, Time bound Define, Measure, Analyze, Implement, and Control Fulltime dedication of people and perfect execution Question 10
The F-statistic is a ratio of what?
Means Standard deviations Variances None of the above Question 11
What does 5S stand for?
Size, set in order, shine, standardize, sustain Size, set in order, shine, standardize, simplify Sort, set in order, shine, standardize, sustain Six Sigma, set in order, shine, standardize, sustain Question 12
What varies more; averages or individuals?
Averages vary more than individuals
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Individuals vary more than averages There is no difference between the two Nobody really knows; there are only theories Question 14
Ensuring that a fixture is non-symmetric so that a part only fits into in the correct orientation is an example of what lean tool?
Poka Yoke Visual workplace Total productive maintenance Kanban What is a type I error?
When we fail to reject the null, when it fact the null was false When we reject the null, when it fact the null was true A Beta error None of the above What is the purpose of Lean?
Understanding and eliminating defects in a process Understanding and eliminating waste in a process Understanding the variability of machinery Understanding value as defined by the business Question 17
Suppose the top 15 percent of producers get bonuses and the average production rate is 200 units with a standard deviation of 20. What would be the Z-score of someone who produces 240 units?
0
1 1.5 2 Question 18
Why must you take a structured approach to root cause analysis?
To find a short-term fix until the project is completed To help teams stay focused and maximize meeting time To find the true cause of the problem and implement a permanent fix To ensure that assumptions can be totally removed from the process How can an affinity diagram help narrow a list of potential root causes?
It can identify differently named things that are actually the same or very similar It can rank the causes to highlight the most important ones It can identify the most actionable causes All of the above Question 20
What is the key difference between prevention and mitigation?
Prevention includes activities such as error proofing or taking in account the process capabilities and performance of a current process to understand characteristics while mitigation reduces the seriousness of an issue from arising but will not eliminate it altogether Mitigation increases the seriousness of an issue while prevention decreases the seriousness of an issue Mitigation error proofs the problem from arising while prevention reduces the seriousness of an issue from arising Prevention does not error proof and mitigation error proofs Question 21
What should you have accomplished by the end of the analyze phase?
Identified the critical root causes to improve Used graphical tools to narrow the list of possible root causes Generated a large list of possible root causes All of the above Question 22
Which of the following are good uses of the F-test for hypothesis testing?
To test the null hypothesis that two normal populations have the same variance To test the null hypothesis that two normal populations with the same standard deviation have the same mean A one-way ANOVA All of the above Question 24
When should you pilot your solutions?
When costs of failure is high When reversal is difficult They may be unintended consequences All of the above Question 25
When using a control chart, one should gather data
That is easiest to collect In the order of production From inspection records None of the above
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