Question 1

A c-chart is appropriate to plot the number of flaws in a bolt of fabric.

Accepted Answer

A) True 
 B)False

Question 2

Some degree of variability is present in almost all processes.

Accepted Answer

A) True 
 B)False

Question 3

In the table below are selected values for the OC curve associated with the acceptance sampling plan n = 50,c = 1.(Watch out-the points are not evenly spaced. )Assume that upon failed inspection,defective items are replaced.Calculate the AOQ for each data point.(You may assume that the population is much larger than the sample. )Plot the AOQ curve.At approximately what population defective rate is the AOQ at its worst? Explain how this happens.How well does this plan meet the specifications of AQL = 0.0050,α = 0.05;LTPD = 0.05,β = 0.10? Discuss.

Accepted Answer

This plan does not meet the sp

Question 4

A process that is assumed to be in control with limits of 89 +/- 2 had sample averages of the following- 87.1,87,87.2,89,90,89.5,88.5,and 88.Is the process in control?

Accepted Answer

A) Yes. 
B) No,one or more averages exceeded the limits. 
C) Not enough information to tell. 
D) No,there is a distinguishable trend. 
E) No,two or more consecutive points are very near the lower (or upper)limit. 
A) Yes. 
B) No,one or more averages exceeded the limits. 
C) Not enough information to tell. 
D) No,there is a distinguishable trend. 
E) No,two or more consecutive points are very near the lower (or upper)limit.

Question 5

Jars of pickles are sampled and weighed.Sample measures are plotted on control charts.The ideal weight should be precisely 11 oz.Which type of chart(s)would you recommend?

Accepted Answer

A) p-charts 
B) c-charts 
C)    - and R-charts 
D)    -,but not R-charts 
E) both p- and c-charts 
A) p-charts 
B) c-charts 
C)    - and R-charts 
D)    -,but not R-charts 
E) both p- and c-charts

Question 6

A retail store manager is trying to improve and control the rate at which cashiers sign customers up for store credit cards.Suppose that the manager wants the maximum standard deviation of the sampling distribution to be 5% and he cannot estimate p-bar.How many observations per sample would this require?

Accepted Answer

Maximum standard deviation occ

Question 7

A small,independent amusement park collects data on the number of cars with out-of-state license plates.The sample size is fixed at n=25 each day.Data from the previous 10 days indicate the following number of out-of-state license plates:
   (a)Calculate the overall proportion of "tourists" (cars with out-of-state plates)and the standard deviation of proportions.
(b)Using ± 3σ limits,calculate the LCL and UCL for these data.
(c)Is the process under control? Explain.

Accepted Answer

(a)p-bar is 56/250 = 0.224;the standard

Question 8

The statistical process chart used to control the number of defects per unit of output is the

Accepted Answer

A)    -chart. 
B) R-chart. 
C) p-chart. 
D) AOQ chart. 
E) c-chart. 
A)    -chart. 
B) R-chart. 
C) p-chart. 
D) AOQ chart. 
E) c-chart.

Question 9

Why doesn't acceptance sampling remove all defects from a batch?

Accepted Answer

Acceptance sampling is a method of measu

Question 10

An operator trainee is attempting to monitor a filling process that has an overall average of 705 cc.The average range is 17 cc.If you use a sample size of 6,what are the upper and lower control limits for the x-bar and R chart?

Accepted Answer

From table, @#IMG-DLM& = 0.483, @#IMG-DLM& = 2.004

Question 11

The x-bar chart indicates that a gain or loss of uniformity has occurred in dispersion of a production process.

Accepted Answer

A) True 
 B)False

Question 12

Pierre's Motorized Pirogues and Mudboats is setting up an acceptance sampling plan for the special air cleaners he manufactures for his boats.His specifications,and the resulting plan,are shown on the POM for Windows output below.Pierre is a bit confused.He mistakenly thinks that acceptance sampling will reject all bad lots and accept all good lots.Explain why this will not happen.

Accepted Answer

Acceptance sampling cannot discriminate

Question 13

Larry's boat shop wants to monitor the number of blemishes in the paint of each boat.Construct a 3-sigma c-chart to determine if their paint process is in control using the following data.

Accepted Answer

@#IMG-DLM& @#IMG-DLM& The proc

Question 14

The ________ is the chief way to control attributes.

Accepted Answer

The answer of The ________ is the chief way to...

Question 15

If the Cpk index exceeds 1

Accepted Answer

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 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." 
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 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."

Question 16

The ________ are calculated to show how much allowance should be made for natural variation.

Accepted Answer

UCL and LC

Question 17

A run test is used

Accepted Answer

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) in acceptance sampling to establish sample size. 
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) in acceptance sampling to establish sample size.

Question 18

Statistical process control charts

Accepted Answer

A) display the measurements on every item being produced. 
B) display upper and lower limits for process variables or attributes,and signal when a process is no longer in control. 
C) indicate to the process operator the average outgoing quality of each lot. 
D) indicate to the operator the true quality of material leaving the process. 
E) display the measurements on every item being purchased. 
A) display the measurements on every item being produced. 
B) display upper and lower limits for process variables or attributes,and signal when a process is no longer in control. 
C) indicate to the process operator the average outgoing quality of each lot. 
D) indicate to the operator the true quality of material leaving the process. 
E) display the measurements on every item being purchased.

Question 19

For an x-bar chart where the standard deviation is known,the Upper Control Limit

Accepted Answer

A) is 3 .σ below the mean of sample means for a 3σ control chart. 
B) is 3 .σ above the mean of sample means for a 3σ control chart. 
C) is 3 .σ/   below the mean of sample means for a 3σ control chart. 
D) is 3 .σ/   above the mean of sample means for a 3σ control chart. 
E) Cannot be calculated unless the average range is known. 
A) is 3 .σ below the mean of sample means for a 3σ control chart. 
B) is 3 .σ above the mean of sample means for a 3σ control chart. 
C) is 3 .σ/   below the mean of sample means for a 3σ control chart. 
D) is 3 .σ/   above the mean of sample means for a 3σ control chart. 
E) Cannot be calculated unless the average range is known.

Question 20

In most acceptance sampling plans,when a lot is rejected,the entire lot is inspected and all defective items are replaced.When using this technique the AOQ

Accepted Answer

A) worsens (AOQ becomes a larger fraction). 
B) improves (AOQ becomes a smaller fraction). 
C) is not affected,but the AQL is improved. 
D) is not affected. 
E) falls to zero. 
A) worsens (AOQ becomes a larger fraction). 
B) improves (AOQ becomes a smaller fraction). 
C) is not affected,but the AQL is improved. 
D) is not affected. 
E) falls to zero.

Exam 18: Statistical Process Control

A c-chart is appropriate to plot the number of flaws in a bolt of fabric.

Some degree of variability is present in almost all processes.

A process that is assumed to be in control with limits of 89 +/- 2 had sample averages of the following- 87.1,87,87.2,89,90,89.5,88.5,and 88.Is the process in control?

Jars of pickles are sampled and weighed.Sample measures are plotted on control charts.The ideal weight should be precisely 11 oz.Which type of chart(s)would you recommend?

The statistical process chart used to control the number of defects per unit of output is the

Why doesn't acceptance sampling remove all defects from a batch?

An operator trainee is attempting to monitor a filling process that has an overall average of 705 cc.The average range is 17 cc.If you use a sample size of 6,what are the upper and lower control limits for the x-bar and R chart?

The x-bar chart indicates that a gain or loss of uniformity has occurred in dispersion of a production process.

Larry's boat shop wants to monitor the number of blemishes in the paint of each boat.Construct a 3-sigma c-chart to determine if their paint process is in control using the following data.

The ________ is the chief way to control attributes.

If the Cpk index exceeds 1

The ________ are calculated to show how much allowance should be made for natural variation.

A run test is used

Statistical process control charts

For an x-bar chart where the standard deviation is known,the Upper Control Limit

In most acceptance sampling plans,when a lot is rejected,the entire lot is inspected and all defective items are replaced.When using this technique the AOQ

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