ISDS 3115 Test 2 – Complete Study Guide &
Practice Questions And Answers Verified 100%
Correct
*A manufacturer uses statistical process control to control the quality of the firm's
products. Samples of 50 of Product A are taken, and a defective/acceptable
decision is made on each unit sampled. For Product B, the number of flaws per unit
is counted. What type(s) of control charts should be used?*
A) p-charts for both A and B
B) p-chart for A, c-chart for B
C) c-charts for both A and B
D) p-chart for A, mean and range charts for B
E) c-chart for A, mean and range charts for B - ANSWER -b
*A nationwide parcel delivery service keeps track of the number of late deliveries
(more than 30 minutes past the time promised to clients) per day. They plan on
using a control chart to plot their results. Which type of control chart(s) would you
recommend?*
A) both x-bar chart and R-chart
B) p-chart
C) c-chart
D) x-bar chart
E) both p-chart and c-chart - ANSWER -c
A run test is used:
A) to examine variability in acceptance sampling plans.
B) in acceptance sampling to establish control.
C) to examine points in a control chart to check for natural variability.
D) to examine points in a control chart to check for nonrandom variability.
E) to test the validity of the Central Limit Theorem - ANSWER -d
*The process capability measures Cp and Cpk differ because:*
,A) only one ensures the process mean is centered within the limits.
B) Cp values above 1 indicate a capable process, while Cpk values above 2
indicate a capable process.
C) They do not differ: both are identical.
D) Cp values for a given process will always be greater than or equal to Cpk
values.
E) Both A and D are correct. - ANSWER -e
A Cp value of 1.33 indicates a standard of how many standard deviations
(sigmas)?
A) 6
B) 1.33
C) 2
D) 3
E) 4 - ANSWER -e
*Which of the following is true regarding the process capability index Cpk?*
A) A Cpk index value of 1 is the highest possible.
B) The larger the Cpk, the more units meet specifications.
C) The Cpk index can only be used when the process centerline is also the
specification centerline.
D) Positive values of the Cpk index are good; negative values are bad.
E) Its value will always be at least as large as the Cp value for the same process. -
ANSWER -b
*If the Cpk index exceeds 1:*
A) the AQL must be smaller than the LTPD.
B) σ must be less than one-third of the absolute value of the difference between
each specification limit and the process mean.
C) the x-bar chart must indicate that the process is in control.
D) the process is capable of Six Sigma quality.
E) the process is characterized as "not capable." - ANSWER -b
*The statistical definition of Six Sigma allows for 3.4 defects per million. This is
achieved by what Cpk index value?*
,A) 6
B) 1
C) 1.33
D) 1.67
E) 2 - ANSWER -e
*A Cpk index of 1.00 equates to what defect rate?*
A) five percent
B) 3.4 defects per million items
C) 2.7 defects per 1,000 items
D) 97.23 percent
E) one percent - ANSWER -c
Consumer's risk is the probability of:
A) accepting a good lot.
B) rejecting a good lot.
C) rejecting a bad lot.
D) accepting a bad lot.
E) none of the above - ANSWER -d
Acceptance sampling:
A) is the application of statistical techniques to the control of processes.
B) was developed by Walter Shewhart of Bell Laboratories.
C) is used to determine whether to accept or reject a lot of material based on the
evaluation of a sample.
D) separates the natural and assignable causes of variation.
E) is another name for 100% inspection. - ANSWER -c
Acceptance sampling's primary purpose is to:
A) estimate process quality.
B) identify processes that are out of control.
C) detect and eliminate defectives.
D) decide if a lot meets predetermined standards.
E) determine whether defective items found in sampling should be replaced. -
ANSWER -d
, An acceptance sampling plan's ability to discriminate between low quality lots and
high quality lots is described by:
A) a Gantt chart.
B) the Central Limit Theorem.
C) a process control chart.
D) an operating characteristic curve.
E) a range chart. - ANSWER -d
Acceptance sampling:
A) may involve inspectors taking random samples (or batches) of finished products
and measuring them against predetermined standards.
B) may involve inspectors taking random samples (or batches) of incoming raw
materials and measuring them against predetermined standards.
C) is more economical than 100% inspection.
D) may be either of a variable or attribute type, although attribute inspection is
more common in the business environment.
E) All of the above are true - ANSWER -e
Which of the following statements about acceptance sampling is true?
A) Acceptance sampling draws a sample from a population of items, tests the
sample, accepts the entire population if the sample is good enough, and rejects it if
the sample is poor enough.
B) The sampling plan contains information about the sample size to be drawn and
the critical acceptance or rejection numbers for that sample size.
C) The steeper an operating characteristic curve, the better its ability to
discriminate between good and bad lots.
D) All of the above are true.
E) All of the above are false. - ANSWER -d
Acceptance sampling is usually used to control:
A) the number of units of output from one stage of a process that are then sent to
the next stage.
B) the number of units delivered to the customer.
C) the quality of work-in-process inventory.
Practice Questions And Answers Verified 100%
Correct
*A manufacturer uses statistical process control to control the quality of the firm's
products. Samples of 50 of Product A are taken, and a defective/acceptable
decision is made on each unit sampled. For Product B, the number of flaws per unit
is counted. What type(s) of control charts should be used?*
A) p-charts for both A and B
B) p-chart for A, c-chart for B
C) c-charts for both A and B
D) p-chart for A, mean and range charts for B
E) c-chart for A, mean and range charts for B - ANSWER -b
*A nationwide parcel delivery service keeps track of the number of late deliveries
(more than 30 minutes past the time promised to clients) per day. They plan on
using a control chart to plot their results. Which type of control chart(s) would you
recommend?*
A) both x-bar chart and R-chart
B) p-chart
C) c-chart
D) x-bar chart
E) both p-chart and c-chart - ANSWER -c
A run test is used:
A) to examine variability in acceptance sampling plans.
B) in acceptance sampling to establish control.
C) to examine points in a control chart to check for natural variability.
D) to examine points in a control chart to check for nonrandom variability.
E) to test the validity of the Central Limit Theorem - ANSWER -d
*The process capability measures Cp and Cpk differ because:*
,A) only one ensures the process mean is centered within the limits.
B) Cp values above 1 indicate a capable process, while Cpk values above 2
indicate a capable process.
C) They do not differ: both are identical.
D) Cp values for a given process will always be greater than or equal to Cpk
values.
E) Both A and D are correct. - ANSWER -e
A Cp value of 1.33 indicates a standard of how many standard deviations
(sigmas)?
A) 6
B) 1.33
C) 2
D) 3
E) 4 - ANSWER -e
*Which of the following is true regarding the process capability index Cpk?*
A) A Cpk index value of 1 is the highest possible.
B) The larger the Cpk, the more units meet specifications.
C) The Cpk index can only be used when the process centerline is also the
specification centerline.
D) Positive values of the Cpk index are good; negative values are bad.
E) Its value will always be at least as large as the Cp value for the same process. -
ANSWER -b
*If the Cpk index exceeds 1:*
A) the AQL must be smaller than the LTPD.
B) σ must be less than one-third of the absolute value of the difference between
each specification limit and the process mean.
C) the x-bar chart must indicate that the process is in control.
D) the process is capable of Six Sigma quality.
E) the process is characterized as "not capable." - ANSWER -b
*The statistical definition of Six Sigma allows for 3.4 defects per million. This is
achieved by what Cpk index value?*
,A) 6
B) 1
C) 1.33
D) 1.67
E) 2 - ANSWER -e
*A Cpk index of 1.00 equates to what defect rate?*
A) five percent
B) 3.4 defects per million items
C) 2.7 defects per 1,000 items
D) 97.23 percent
E) one percent - ANSWER -c
Consumer's risk is the probability of:
A) accepting a good lot.
B) rejecting a good lot.
C) rejecting a bad lot.
D) accepting a bad lot.
E) none of the above - ANSWER -d
Acceptance sampling:
A) is the application of statistical techniques to the control of processes.
B) was developed by Walter Shewhart of Bell Laboratories.
C) is used to determine whether to accept or reject a lot of material based on the
evaluation of a sample.
D) separates the natural and assignable causes of variation.
E) is another name for 100% inspection. - ANSWER -c
Acceptance sampling's primary purpose is to:
A) estimate process quality.
B) identify processes that are out of control.
C) detect and eliminate defectives.
D) decide if a lot meets predetermined standards.
E) determine whether defective items found in sampling should be replaced. -
ANSWER -d
, An acceptance sampling plan's ability to discriminate between low quality lots and
high quality lots is described by:
A) a Gantt chart.
B) the Central Limit Theorem.
C) a process control chart.
D) an operating characteristic curve.
E) a range chart. - ANSWER -d
Acceptance sampling:
A) may involve inspectors taking random samples (or batches) of finished products
and measuring them against predetermined standards.
B) may involve inspectors taking random samples (or batches) of incoming raw
materials and measuring them against predetermined standards.
C) is more economical than 100% inspection.
D) may be either of a variable or attribute type, although attribute inspection is
more common in the business environment.
E) All of the above are true - ANSWER -e
Which of the following statements about acceptance sampling is true?
A) Acceptance sampling draws a sample from a population of items, tests the
sample, accepts the entire population if the sample is good enough, and rejects it if
the sample is poor enough.
B) The sampling plan contains information about the sample size to be drawn and
the critical acceptance or rejection numbers for that sample size.
C) The steeper an operating characteristic curve, the better its ability to
discriminate between good and bad lots.
D) All of the above are true.
E) All of the above are false. - ANSWER -d
Acceptance sampling is usually used to control:
A) the number of units of output from one stage of a process that are then sent to
the next stage.
B) the number of units delivered to the customer.
C) the quality of work-in-process inventory.
