Practice Exam Flashcards
(25 cards)
A Value Stream Map is used primarily to improve ____________.
Process efficiency
The two fundamental issues addressed by Six Sigma include the monitoring of process _____________ and process _____________.
mean, and variation
Which of the following is not part of the DMAIC cycle?
Control, Install, Define, Measure
Install
Lean focuses on ____________ while Six-Sigma focuses on ____________.
efficiency, consistency
The standard deviation measures the ______________ in a dataset.
variation of data
When the mean of a normal distribution is 10, and its standard deviation is two, ninety-five percent of the data points within the distribution will fall between plus and minus ______________ standard deviations from the mean.
Two
A Six Sigma designed process will produce no more than _______ defects per million outcomes.
3.4
When the assumption of normality cannot be assured, which of the following hypothesis tests can be used to test the difference between two means?
Mann Whitney
Establishing a ____________ is necessary when creating a process control chart.
A. Target or mean
B. Upper Control Limit
C. Lower Control Limit
D. All of the above
All of the above
An X-bar chart is used to monitor process means when sample sizes are _________________.
A. large
B. small
C. greater than 100
D. large or small
large or small
An X-bar chart for larger sample sizes, N>25, uses the ____________ to determine the UCL and LCL.
A. average population range
B. average sample range
C. Standard Error of the Mean
D. Lower and Upper Service Levels
Standard Error of the Mean
Which of the following is not determined by using the short cut formulas for process control charts?
A. UCL
B. LCL
C. LSL
D. Centerline
LSL
An S-Chart is used to monitor process ___________ when the size of the sample, N, is greater than 12.
A. Variation
B. Errors
C. Mean
D. Defects
variation
Which of the following Six Sigma Tools is not used in the problem-finding phase?
A. Histogram
B. Pareto Diagram
C. Taguchi Diagram
D. Fishbone diagram
Taguchi Diagram
The distribution that describes the way in which sample means of a certain size are distributed about the population mean is called the ____________________ .
Distribution of Sample Means
Which of the following p-values, associated with the coefficient of an independent variable in a multiple regression model, suggests the significance of that variable at the 0.05 level?
A: 0.01
B: 0.10
C. 0.50
D. 1.00
0.01
Upper and Lower Control Limits for large samples are commonly set at plus or minus _________standard Errors of the Mean from the center line or target of the process control chart.
three
Which Six Sigma tool is most useful when identifying outputs and inputs?
SIPOC diagram
Which of the following charts are used in the design of a control process where small samples, N<12, will be taken and the results plotted on a control chart?
A. X-Bar and R-Chart
B. X-Bar and S-Chart
C. R-Chart and S-Chart
D. Population and Sampling Distribution of the Mean charts
X-Bar and R-Chart
Which of the following represents an Alpha error?
A. A sample mean within the LCL and UCL, but the process mean has not shifted
B. A sample mean between the LSL and USL, but the process mean has shifted.
C. A sample mean outside the LCL or UCL, but the process mean has not shifted
D. A sample mean outside the LCL or UCL when the process mean has shifted
A sample mean outside the LCL or UCL, but the process mean has not shifted
Which of the following suggests that as a process shifts farther and farther away from its target, the cost to the company grows larger and larger?
A. Pareto Chart
B. Value Stream Map
C. Histogram
D. Taguchi Loss Function
Taguchi Loss Function
True or False
Without making any changes to the process, the quality of process output can be improved by placing the LCL and UCL closer to the process mean or target.
False
A process has been redesigned. It is now necessary to determine if it has met its goals. A sample is taken. Assume normality. Which of the following tests will determine if this objective has been met?
A. One sample t test
B. Two sample t test
C. ANOVA
D. Any Nonparametric test will work
One sample t test
The shortcut formula used to establish the LCL and UCL in an R-chart requires which of the following preliminary steps to compute the value of the average range that will be used as the centerline of the chart.
A. Taking five or more preliminary samples, computing the range of these samples by subtracting the lowest result from the highest result, then computing the average of these ranges.
B. Dividing the standard deviation of a single sample by six.
C. Taking five or more preliminary samples, computing the mean of each sample, and then computing the mean of these means.
D. Taking one sample and subtracting the lowest result from the highest result.
Taking five or more preliminary samples, computing the range of these samples by subtracting the lowest result from the highest result, then computing the average of these ranges.
