20 questions. mutiple hoice/true false
Question 1 (1 point)
Process capability calculations make little sense if the process:
Question 1 options:
-data were taken over a period of time
-is not in statistical control
-variations are due to special causes
-has control but is not capable
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Question 2 (1 point)
In a variable sample size situation–such as when the number of units produced varies–if the sample size in a p-chart increases from 100 to 120, the upper and lower control limits will:
Question 2 options:
-move farther apart
-move closer together
-remain the same distance apart
-both shift upward
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Question 3 (1 point)
Twenty samples of size 6 were collected for a variable measurement. Determine the upper control limit (UCL) and lower control limit (LCL) for an R-chart if the sum of the sample ranges equals 88.0.
Question 3 options:
UCL = 8.8176, LCL = 0.0000
UCL = 9.3016, LCL = 0.3344
UCL = 13.2000, LCL = 0.0000
UCL = 29.3921, LCL = 0.0000
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Question 4 (1 point)
A(n) _____ is a performance characteristic that is either present or absent in the product or service under consideration.
Question 4 options:
-variable
-control limit
-attribute
-performance range
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Question 5 (1 point)
Control limits relate to _____, while specification limits relate to individual measurements.
Question 5 options:
-values within the upper and lower control limits
-total values in the range
-median values
-averages of samples
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Question 6 (1 point)
An alternative to using the R-chart is the:
Question 6 options:
np-chart
s-chart
c-chart
p-chart
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Question 7 (1 point)
The sample size for an x-chart:
Question 7 options:
-should be greater than or equal to 30
-is larger than that for an Xbar-chart
-is equal to one
-depends on the number of measurements taken
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Question 8 (1 point)
Which of the following is NOT an indication of an out-of-control process?
Question 8 options:
-Five consecutive points fall on one side of the center line
-Four of five consecutive points fall within the outer two-thirds region between the center line and one of the control limits
-Two of three consecutive points fall in the outer one-third region between the center line and one of the control limits
-A single point falls above the upper control limit
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Question 9 (1 point)
A precision parts manufacturer produces bolts for use in military aircraft. The specifications for bolt length are 37.50 ± 0.25 cm. The company has established an Xbar-chart and an R-chart using samples of size five. The centerlines for the Xbar-chart and R-chart are set at 37.65 cm and 1.03 cm, respectively. What is the value of Cpk for this process?
Question 9 options:
0.08
0.28
0.75
0.03
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Question 10 (1 point)
Short repeated patterns in a control chart, with alternating high peaks and low valleys, are known as:
Question 10 options:
-trends
-cycles
-spikes
-reciprocals
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Question 11 (1 point)
Which of the following pairs of charts are used together?
Question 11 options:
Xbar-chart and p-chart
R-chart and p-chart
R-chart and s-chart
Xbar-chart and R-chart
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Question 12 (1 point)
In pre-control, which zone covers the nominal dimension?
Question 12 options:
-Gray zone
-Yellow zone
-Red zone
-Green zone
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Question 13 (1 point)
Statistical process control relies on _____.
Question 13 options:
-capability models
-variance analyses
-control charts
-conformance reports
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Question 14 (1 point)
Which of the following charts is used to monitor the total number of defects per unit when a constant subgroup size is employed?
Question 14 options:
s-chart
c-chart
p-chart
u-chart
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Question 15 (1 point)
Collecting _____ data is usually easier than collecting _____ data because the assessment can usually be done more quickly by a simple inspection or count.
Question 15 options:
-attribute; variable
-concrete; continuous
-random; discrete
-simple; continuous
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Question 16 (1 point)
When using a control chart — one rule of thumb is to have a minimum of 25 data points–preferable 40 or more.
Question 16 options:
True
False
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Question 17 (1 point)
When the R-chart is not in control (has a signal), you should not investigate signals found in the related Xbar chart.
Question 17 options:
True
False
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Question 18 (1 point)
Before control charts can be used to identify the presence of special causes on line, the process must be brought into a state of statistical control; that is, the data used to establish the charts and define the control limits must be subject only to a constant system of common causes.
Question 18 options:
True
False
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Question 19 (1 point)
A scatter diagram can help identify possible relationship patterns and the dispersion around those patterns
Question 19 options:
True
False
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Question 20 (1 point)
A flow chart can help document the product stream (rational ample) associated with the data plotted in a control chart.
Question 20 options:
True
False
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