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Unformatted text preview: subgroups of size four are being used to
monitor the tire diameter size of a new radial tire manufactured by a tire company. The
and R charts are found to be in statistical control with
inches. A histogram
of the tire diameter measurements indicates that distribution of these measurements is
approximately normally distributed.
Calculate the estimate of the percentage of tires that are out of specification.
A. 1.93%
B. 2.68%
C. 1.62%
D. 17.36% 11685 Chapter 01  An Introduction to Business Statistics 99. Suppose that and R charts are based on subgroups of size four are being used to monitor the tire diameter size of a new radial tire manufactured by a tire company. The
and R charts are found to be in statistical control with
inches. A histogram
of the tire diameter measurements indicates that distribution of these measurements is
approximately normally distributed.
Find the sigma level capability of the process.
A. 1.93
B. 3.22
C. 0.64
D. 0.22 100. Among other quality measures, the quality of an electronic component used in
manufacturing stereo speakers is monitored with a pchart. In the last 25 days daily samples
60 units resulted in the following number of defective units per sample: 8, 4, 3, 7, 6, 2, 5, 3, 1,
0, 7, 4, 2, 0, 1, 6, 2, 4, 3, 1, 2, 8, 5, 6, 0. Determine the center line for this process.
A. .06
B. .03
C. .001
D. .056 101. Among other quality measures, the quality of an electronic component used in
manufacturing stereo speakers is monitored with a control chart. In the last 25 days daily
samples 60 units resulted in the following number of defective units per sample: 8, 4, 3, 7, 6,
2, 5, 3, 1, 0, 7, 4, 2, 0, 1, 6, 2, 4, 3, 1, 2, 8, 5, 6, and 0. Determine the appropriate upper and
lower control limits for this process.
A. (.029 .091)
B. (.056 .064)
C. (0 .152)
D. (0 .202) 11686 Chapter 01  An Introduction to Business Statistics 102. The quality of an electronic component used in manufacturing cell phones is monitored
with a pchart. In the last 20 days daily samples of 75 units resulted in the following number
of defective units per sample:
8, 4, 3, 7, 3, 1, 0, 7, 4, 2, 0, 1, 6, 2, 4, 3, 1, 2, 8, 5
Find the appropriate center line.
A. .0473
B. .2667
C. .1067
D. .0133 103. The quality of an electronic component used in manufacturing cell phones is monitored
with a pchart. In the last 20 days daily samples of 75 units resulted in the following number
of defective units per sample:
8, 4, 3, 7, 3, 1, 0, 7, 4, 2, 0, 1, 6, 2, 4, 3, 1, 2, 8, 5
Find the LCL and UCL for the pchart
A. (0 .1208)
B. (.0228 .0718)
C. (0 .1897)
D. (.0445 .0501) 104. The quality of an electronic component used in manufacturing cell phones is monitored
with a pchart. In the last 20 days daily samples of 75 units resulted in the following number
of defective units per sample:
8, 4, 3, 7, 3, 1, 0, 7, 4, 2, 0, 1, 6, 2, 4, 3, 1, 2, 8, 5
If on the 21st day, 9 defective units were found in the sample of 75 units, would the process be
in control?
A. Yes
B. No 11687 Chapter 01  An Introduction to Business Statistics 105. Suppose that
and R charts are based on subgroups of size four are being used to
monitor the tire diameter size of a new radial tire manufactured by a tire company. The
and R charts are found to be in statistical control with
inches. A
histogram of the tire diameter measurements indicates that distribution of these measurements
is approximately normally distributed. Compute the natural tolerance limits for this process.
A. (48.68 52.32)
B. (49.89 51.11)
C. (48.86 52.14)
D. (46.75 54.25) 106. A motorcycle manufacturer produces the parts for its vehicles in different locations and
transports them to it plant for assembly. In order to keep the assembly operations running
efficiently, it is vital that all parts be within specification limits. One important part used in
the assembly is the engine camshaft and one important quality characteristic is the case
hardness depth. Specifications state that the hardness depth must be between 3.0 mm and 6.0
mm. To investigate the process, the quality control engineer selected 25 daily subgroups of n
= 5 and measured the hardness depth. The process yielded a mean of the means
= 4.50 and
an average range = 1.01.
Calculate the center line for the Xbar chart.
A. 1.01
B. 4.50
C. 3.49
D. 0.90 107. A motorcycle manufacturer produces the parts for its vehicles in different locations and
transports them to it plant for assembly. In order to keep the assembly operations running
efficiently, it is vital that all parts be within specification limits. One important part used in
the assembly is the engine camshaft and one important quality characteristic is the case
hardness depth. Specifications state that the hardness depth must be between 3.0 mm and 6.0
mm. To investigate the process, the quality control engineer selected 25 daily subgroups of n
= 5 and measured the hardness depth. The process yielded a mean of the means
= 4.50 and
an average range = 1.01.
Calculate the center line for the R chart.
A. 1.01
B. 0.22
C. 4.50
D. 0.90 11688 Chapt...
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